Best K Locksmith gets one call more than almost any other: "my key won't turn." It usually happens at the worst moment. You are standing on the porch with groceries, the temperature is dropping, and the deadbolt refuses to move. When a key won't turn, there is usually a simple explanation. Some you can fix yourself in two minutes. Others need a technician before the key snaps off inside the cylinder. This guide walks through the causes, the safe things to try, and the point where forcing it will only make things worse.
Why a Key Won't Turn: The Six Usual Suspects
A lock is a mechanical puzzle. When the key stops turning, one piece has moved out of place. Here are the causes we see most often on Ottawa doors.
Worn or damaged key
Keys wear down with every use. After several years, the cuts become rounded and the pins no longer lift to the right height. A copy of a copy makes this worse, because each duplicate drifts a little further from the original code. If a spare key works and your daily key does not, the key is the problem.
Dirt and dried lubricant inside the cylinder
Cylinders collect dust, pocket lint, and old grease. Petroleum sprays feel helpful at first, then turn gummy. Pins start to stick halfway, and the plug will not rotate. This is the most common cause on older locks.
A misaligned door or strike plate
Houses shift with the seasons. Ottawa's freeze-thaw cycles move door frames enough that the deadbolt no longer lines up with the strike plate. The key turns partway, then binds against the frame. Lifting or pushing the door while you turn the key is the classic tell.
Frozen lock
Moisture gets into the keyway, then freezes overnight. The key goes in but will not rotate. This peaks between December and March, but it can happen during early fall cold snaps too.
Broken or worn internal parts
Springs fatigue, pins chip, and the cam or tailpiece that connects the cylinder to the bolt can crack. When this happens, the key may spin freely without moving the bolt, or it may stop dead.
Wrong key or a fresh rekey
It sounds obvious, but it happens weekly. Someone had the lock rekeyed, or new keys got mixed up with old ones. Check the key head stamp against the lock brand first.
What You Can Safely Try First
Before you call anyone, run through these steps in order. Stop as soon as the key turns, and stop immediately if you feel it flexing.
- Take the weight off the door. Pull the handle toward you, then push it away, while turning the key gently. If it turns in one position, alignment is your issue.
- Try the spare. A different key rules out wear on your daily key.
- Apply a dry lubricant. A graphite or PTFE-based lock lubricant is the right choice. Insert the key a few times to spread it. Avoid oil-based sprays.
- Warm a frozen lock. Warm the key with your hands or a lighter for a few seconds, then insert it. Never pour hot water into the lock; it refreezes fast.
- Jiggle, don't force. Light in-and-out movement can seat the pins. Twisting hard is how keys break.
If none of these work within five minutes, the lock needs professional attention. Our urgent lock repair service is available around the clock for exactly this situation.
Symptom Guide: What the Lock Is Telling You
| Symptom | Likely cause | What we do |
|---|---|---|
| Key goes in but won't turn at all | Worn key, dirt, or wrong key | Decode the lock, cut a fresh key, clean the cylinder |
| Key turns partway then stops | Misaligned strike plate or bolt | Adjust strike plate, re-hang or shim the door |
| Key spins freely, bolt doesn't move | Broken tailpiece or cam | Replace the internal part or the cylinder |
| Key only turns with the door pushed in | Frame movement | Realign, reinforce the strike, check hinges |
| Key sticks going in and out | Gummed pins or bent key | Flush and re-lubricate, replace the key |
| Lock works in summer, fails in winter | Moisture freezing inside | Dry lubricant, weather cap, cylinder service |
When a Key Won't Turn: Why Forcing It Is a Mistake
The instinct is to push harder. Please don't. Most household keys are brass or nickel-silver, and both snap under torque. Once the key breaks flush with the face of the cylinder, you have a second problem on top of the first one. Extraction takes a specialist tool and adds time to the visit.
Forcing also damages the lock itself. Pins can jam at an angle, and the plug can be scored. A cylinder that could have been cleaned and rekeyed may end up needing full replacement. On an older frame, hard pressure can even split the jamb.
By industry estimates, roughly one in four broken-key calls began as an intact key that was forced. Patience pays.
How a Locksmith Diagnoses and Fixes the Problem
When a technician from Best K Locksmith arrives, the first step is a quick assessment, not a replacement. We check the key against the lock code, test the cylinder with a known-good blank, and look at the door alignment. That tells us within a few minutes which of the six causes you have.
Then the fix follows the cause:
- Worn key: we cut a new key from the lock's code, not from the worn copy, so it matches the original specification.
- Dirty cylinder: we flush, dry, and re-lubricate. Often the lock feels brand new afterward.
- Alignment: we adjust or replace the strike plate and check the hinges. This is also a good time to consider reinforcing the door frame if it has moved a lot.
- Broken internals: we replace the cylinder or the whole deadbolt. If you want to keep your existing keys, rekeying the new cylinder to match is usually possible.
- Security concern: if a key was lost rather than worn, rekeying the lock makes the old keys useless without changing the hardware.
We carry the common residential brands on the truck, so most repairs finish in a single visit. We give an honest quote after the assessment, before any work starts.
Preventing the Next Stuck Lock
A little maintenance goes a long way. Most manufacturers, including Schlage, publish care guidance for their cylinders; their support pages are a useful reference for cleaning intervals and approved lubricants.
- Lubricate exterior locks with a dry product twice a year, ideally in spring and late fall.
- Replace daily-use keys every five to seven years, and cut copies from the original, not from another copy.
- Check that the deadbolt throws fully without lifting the door. If it does not, fix the alignment before winter.
- Keep a spare key with a trusted neighbour so a stuck lock is never a full lockout.
- Have any lock older than 15 years inspected. Springs and pins have a working life like any other part.
Frequently Asked Questions
Why does my key turn in the knob but not the deadbolt?
The two locks have separate cylinders, and deadbolts carry more load from the door frame. Alignment problems show up in the deadbolt first. Try lifting the door while turning the key. If it works, the strike plate needs adjustment.
Can WD-40 fix a lock that won't turn?
It may work once, but it attracts dust and turns sticky within weeks. Use a graphite or PTFE dry lubricant made for locks. If you already used an oil spray, a locksmith can flush the cylinder and reset it.
My key won't turn and it's minus twenty outside. What now?
Warm the key, not the lock, and try again with gentle pressure. Do not use hot water or a hair dryer on a wooden door. If it still refuses, call us. Emergency calls are answered 24/7 across Ottawa.
Should I replace the lock or just fix it?
If the cylinder is clean, the parts are intact, and the lock is under 15 years old, a repair or rekey is usually the better route. If the internals are broken or the lock has no bump or drill resistance, replacement is the sensible upgrade.
Will you need to drill my lock?
Rarely. Drilling is a last resort for damaged high-security cylinders. In most stuck-key calls we clean, adjust, or rekey without destroying anything.
Stuck Key? Contact Best K Locksmith
Best K Locksmith serves Ottawa and the surrounding communities with mobile lock repair, rekeying, and emergency lockout help.
- Phone: (613) 707-4884 (emergency calls answered 24/7)
- Address: 3835 McBean St, Ottawa ON K0A 2Z0
- Hours: Mon–Thu 8 AM–8 PM, Friday 8 AM–5 PM, Saturday closed, Sunday 8 AM–8 PM
Call before you force the key. A quick phone conversation often solves the problem; if not, a technician can be on the way.