[lvturner]

Having seen the way people 'queue' when waiting outside an eatery implementing social distancing guidelines - this only solves part of the problem.

Edit: Perhaps integrating it with some sort of QR Code based ticketing system for entry would alleviate the issues of people queueing (or huddling) outside the store?

[afar]

You're right. "Notify me when it's quiet" is a thing the system supports. In related news, load balancing humans is a two-sided thing.