How do you fix a stuck mortise lock?

Hello there. This can be a tricky situation, so let's rule out the simplest solutions first. Have you tried removing the handle set and then attempting to manually 'throw' the mortise lock with a flathead screwdriver? You also may want to try moving the door 'up and down' while doing this. If this doesn't work, you may want to contact a local pro for help, as unfortunately you may not be able to get around cutting a hole to get the lock out. Let us know if you have any other questions.