If you've ever worked in the food service industry , you certainly know the pain of customers coming in right minutes before closing. While it's still technically appropriate and enforced by management, the last thing you want after an eight-and-a-half-hour shift is to stick around an extra hour for a couple of customers. If you've never worked in hospitality, it's understandable that you might not understand the common decency of the appropriate window of hours of operation. But my personal be…