I have got an old fashioned mortice lock which has a roller rather than wedge shaped latch. It has jammed! In the lock plate of course. I have tried removing the handle and manually turning the Tommy bar. It is solid. I have also tried to get a thin strip of metal between the plate and latch to lever it back. No success.
So before I take a multi tool to cut off the latch is there anything else I can try?
I have ordered a replacement lock as whatever happens I am not risking getting stuck again.