Open the door and squirt graphite powder into the key lock.
Thumb press door handle sticking.
The issue a door latch stuck due to a jamming latch will have no real variation between how the latch moves when it is pressed in or when the handle is turned both when the door is open and when it is shut.
This is because the issue is not with the door and not even with the control the knob has over the stuck latch.
Squirt the bolt with graphite powder.
Remove the cap on the graphite powder.
Turn the knob to open the door and release the knob slowly.
The most common cause of sticking door handles is some kind of malfunction within the tubular latch itself.
Release the button quickly try sliding your finger off the button so the pressure is maintained up until the precise moment of release with no backing off.
Turn the handle of the doorknob to expose the bolt.
Once you let go of the knob grab the end of the latch bolt with your fingers and pull.
If the latch bolt doesn t move and is fully extended the issue is with the strike plate.
If the latch bolt moves it is sticking in the door knob and requires some disassembly to fix.
Push and hold the button in.