Closing Time?

Over the previous year, I went to two restaurants with the following posted hours, respectively:

Of course the object of interest is their closing time, or lack thereof.

I can just picture an Abbott and Costello bit going something like this:

Me: What time do you close.

Waitress: When we close.

Me: Yes, when do you close.

Waitress: When we close.

Me: Yes, yes. That is my question. When does this restaurant close?

Waitress: Our restaurant closes when it closes.

Me: Of course it closes when it closes. I am asking you at what time it closes.

Waitress: The closing time is when it closes.

Me: *sigh*