Honestly, and I’m not saying that this is a universal, most stores do have a sign with their hours of operation on or near the door.

And if you go to a store and can’t open the door, the fact that the store is closed really should be the default assumption.

I’ve tried the door on closed restaurants before and had someone open it and explain that the place is closed, but I’ve also had people just expect one to read the sign. I don’t think that just because there’s someone in the establishment, that they should be obliged to spell the thing out and give you the hours. It’s nice if it happens, but…