I have a key to an apartment mailbox that was almost impossible to get the key in and out of to unlock, and in trying, my roommate broke the key off in it. From looking in with a light, it seems that all of the key except the outermost pin is in the lock, but the lock won't turn even when putting the head back in.
I've generously lubricated the lock, tried hooking a small scroll saw blade in the teeth, and used a lockpick set with various hooks to try dragging the key out, but it's pretty firmly stuck. So my question is: with this being an entire row of mailboxes and me unable to just remove the lock, how would you recommend either getting the key out, or replacing the lock?