The last resort is to disassemble the lock to see if something has jammed or is broken you may be able to set it straight or replace the part without buying a whole new lock.
Thumb turn lock jammed.
The key may be damaged or worn and no longer fits properly in the cylinder.
Lock de icers contain alcohol and other lubricants that help to dissolve gummy dirty deposits.
Lock de icers are available on amazon.
Door lock stuck in open position.
How to fix a sticky lock.
The deadbolt lock is stuck in the open position.
If the lock is old the bolt or the intervals may be gummed up or rusted and seized up in the open position.
With your door lock stuck in unlocked the position your home can be made vulnerable.
A jammed lock can cause someone to miss work be late for appointments and in general wreak havoc in a daily routine.
After enough use you might find that your door lock has begun to stick making it difficult to put in turn or pull out your key.
If there s a thumb turn try actuating the bolt with it.
This occurs when dust dirt grime and other buildup accumulates on the internal.