What happened here?!?

You got fired, and you got fired!
You're all getting fired!

Total cleaning

Well I'm guessing a pretty good portion of the general crew just got pissed off and decided to walk out/quit at one time.

Could be they're hiring for more than this one store. Or the manager could be an asshol* and everyone quit. Happened at a restaurant i used to work. Everyone walked except her daughter and one manager. And all at the same time.

The health department happened.

Deadpool was here.

Or maybe they're opening new place so they need entire new staff