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Stiff Lock Or Key Hard To Turn
The key needs wiggling, jiggling or real force to turn, and the lock is getting worse rather than better.
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What's happening?
A lock that has become stiff is telling you something is out of line before it fails. Usually it is not the lock at all: the door has dropped or swollen, so the bolt is scraping against the keep plate rather than sliding into it, and the extra force ends up going through the key. The other common causes are a worn key that no longer matches the pins, and a cylinder that has dried out or filled with dust. All of them are fixable while the lock still turns. Left alone, one of two things happens — the key snaps off in the lock, or the mechanism gives up with the door shut. The Master Locksmiths Association is blunt that a lock which is sticking is worth attending to rather than forcing.
What usually causes it?
- The door dropped or swollen, so the bolt is catching on the keep plate instead of entering it
- A worn or copied key that no longer lifts the pins cleanly
- Dust, grit and old grease dried inside the cylinder
- A hinge that has worked loose, throwing the whole door out of alignment
- A keep plate or strike that has shifted, or screws that have loosened in the frame
- Cold weather thickening old oil-based lubricant inside the mechanism
- The wrong lubricant used — oil and general-purpose spray attract dust and gum a cylinder up over time
Is it dangerous?
Not in itself, but it leads somewhere bad. A key that needs forcing is a key that will eventually snap, usually on a cold evening with shopping in your hands, and a mechanism that seizes with the door closed leaves you locked out or locked in. On a final exit door that matters more than convenience.
Can I fix it myself?
Try the alignment first. Open the door and turn the key with the door open — if it turns easily like that, the lock is fine and the door or the keep is the problem, so check and tighten the hinge screws and the keep plate. For the cylinder itself, use a dry graphite or PTFE lock lubricant rather than general-purpose oil, which gums up with dust. Stop if the key needs real force: one more turn is how keys snap.
When should you call a handyman?
A handyman is the right call while this is an alignment or a maintenance job — easing the door, re-setting the keep, tightening hinges and lubricating properly. Where the key has already snapped, where the mechanism itself has failed, or where the lock needs replacing to meet an insurance requirement, that is a locksmith's work rather than a handyman's.
What will the handyman actually do?
- Test the lock with the door open to separate a lock fault from an alignment problem
- Tighten and repair hinge fixings and re-set the keep plate so the bolt enters cleanly
- Ease a swollen door edge where it is binding against the frame
- Clean and lubricate the cylinder with a dry lock lubricant rather than oil
- Check the door closes and locks without force, and flag a worn mechanism for a locksmith rather than forcing it
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