My college years were spent working until midnight at a food service job, then I got away from it for about ten years, then while working a ~9-5 I got a second job delivering pizzas in the evening. That shift of workers invited me for drinks after close, but I always had to decline because I had responsibilities to get back to and delivery was just extra money. Still, your point stands that a huge part of the workforce that maintains this way of life doesn't get to participate in business hours. It's one thing I like about my town because it has a lot of "food handlers happy hours" on Mon-Tue or during late hours