mortise lock

Hello there. Unfortunately there's no real way of doing this. A professional might be able to cut a hole in the door to get it out for you, but that's a very costly and messy solution. You're better off just replacing the lock. Now without seeing the original I can't be sure what you have, but its almost certainly the 82-218, since we hear it falling into doors more than any other lock. Look it over and see if you agree.