My wife, nephew, and a number of my in-laws work in the hospitality industry. A majority of the staff in this particular establishment is made up of immigrants- like many places, the white folks work up front, the brown folks work behind the scenes, and the brown folks do the bulk of the work.
Literally, without them, the business would go under. They make this place what it is. They're the lifeblood of the company. The white faces are mostly just that- faces. They greet you, speak to you, etc, but they don't do most of the work.