If the register isn't at least 5 tiles away the people stand there forever. Maybe they just need to be in the bakery for a certain amount of time, but it makes me happy.
Currently Playing Bakery Story, I'm always adding friends!
You don't have to spend gems for extra doors anyways.
Coffee Swirl Door is 19,500 gold while the Lodge Door is 5 gems. (Although I'm not 100% sure the lodge is an actual door and not a decoration)
Both of these are real doors for customers to use.