[Yeah no he's not going to bother people for money for snackfoods. He will go back to inspecting the panel idly as he speaks.]

They have to put food into it, so there must be a door. Perhaps this is the lock?

[He points to a small keyhole, near the keypad.]

I am not sure how it would open, though. There is no obvious door on it, besides the small one at the bottom.