Jackson Heights Life

I have an interior door handle that left to its own devices will trap me in my room for all eternity.  I love the antique handles but clearly need to have the latch mechanism fixed.  Currently I just have it all taped over so I don't get stuck.

I don't want to call any old locksmith who might butcher the door. Does anyone have a recommendation of someone who might be able to do this? It feels like a low-key handyman project or locksmith project (I don't know) but I just want to be sure I am using someone who knows what they are doing and can preserve the handles while fixing the internal issue.