>Serving up food you didn't even cook isn't an intensely difficult or skilled job.

Then it should be easy to automate, but the best I've seen is a conveyor belt or a box on top of a roomba. In reality it's a very skilled job, it's just that most everyone is capable of doing it. And "fair" is any wage were you can live and increase the quality of your life over time as much as your work has increased the quality of others.