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.
Thumb press door handle sticking.
This is for when the door lock button is stuck in as this is often the most common type of door button sticking.
You should first test the door latch to ensure the latch is sticking inside the door and not due to a misaligned strike plate.
The thumb latch feature on older handleset mortise locks were never terribly efficient it was usuallthe second thing to fail after the inner knob would come loose due to inadequate set screw issues.
A sticking door latch might require some lubrication or it might be jamming against the strike plate on the door jamb.
Jiggle the handle more vigorously fast though not with too much force if you are not getting results.
If the door knob lock button is still stuck try turning the handle while experimenting with the ways you are pressing the button.
Open the door and look for obstructions in the door lock plate like loose screws.
Turn the knob to open the door and release the knob slowly.
2 close the door and look at the.