I am helping someone with a lost key for her bedroom (interior) door; the door hardware is probably about 100 years old. There is clearly a lock and a keyhole -- see photos.
What sort of key would activate the lock, and where would I get it? Are these precise keys that require a locksmith, or would a generic skeleton key work?
UPDATE: I got the keys and I am not sure if they are correct as the lock itself seems to be seized up, possibly from being painted over in the past. When I turn it, it moves a tiny bit (1/32") but then seems to be stuck. How can I tell if I have the wrong key or it's stuck somehow? I sprayed lubricant on it but that didn't affect it.