Think further into the future.
You order food with an app, the food is prepared by robots, and delivered to you by drone. This method would actually be leaps and bounds more effective, convenient, and cheaper.
Costs would be waaaaay down because you wouldn't' have to deal with staff, order accuracy would be nearly 100% (besides the occasional glitch), and you wouldn't have to create convenient locations because everything is distributed from a central regional location.