what is a "constant line at the door of a resturant"?

Question

the original sentences go in this way:
the reason i don't like being a waiter is that i was always moving. because of the constant line at the door, as soon as one group left, another would take its place. i usually have only a twenty -minute lunch and a ten-minute break in almost nine hours of work.

Answer 1

Just like Gino's East in Chicago, the finest pizza in the known universe. Line out the door on weekends. Wait to get in. In winter, it's GD cold outside, too!

Answer 2

this must be a very good restaurant, as people always do line up and wait to be seated .... as a waiter, he hates this since he has no time to relax ...