Selling and delivering newspapers was a great introduction for young children to entrepreneurship. On that note I remember when the Boy Scouts had paper drives. Collecting newspapers etc. for (AKA recycling) funding their programs.
Just insert the kid through this door, make your selection and lickety-split you can pick up your order at the window in just a few moments....
That reminds me of a Chinese buffet I ate at ONCE that had a sticky note stuck to the sneeze glass that had "meat" scrawled on it. It did appear to be some kind of meat.