This idea was first implemented in Germany in 1895. It's nothing new. Big cities had Automats starting in 1902. You can read all about it here: https://en.wikipedia.org/wiki/Automat

I wonder if food will be cooked by robots. I worked on vending machines many years in the past, and I know how badly coffee machines worked, dropping the cup after the coffee had already come out, etc. And they were nasty inside.