I am looking for the proper English name of the little hole in door frames where the latch goes in. Specifically, I want to know what that hole is called for "indoor" doors, without a lock, e.g. the door to a bedroom. Please note that I want to refer to the hole itself, not to the metal plate surrounding it.
Is there a term in common use, as opposed to a professional term? For example, "I got my finger stuck in the ....". Even if there's not one word to describe it, how would a native English speaker finish that sentence?
Here's a picture of what I'm talking about: