I live in the hood and am also a small business owner. I pit an order in at Noodlehead and Wales over....I opened the door and was told, "Just so you know, we do close in 5 minutes."
Okay, so I left. How about, "Hey, are you looking for something?" or, God forbid, "How can I help you?" Would it be a big deal to stay 10 minutes late? I hope the owners know how their store is run when they are not there.