It was a very straightforward process done by the manager in the the store. It took 20 minutes and I was asked basic questions you would expect for your first job.
It was ok, they wanted to know about my calculus classes and if I knew Pi without googling it. They also wanted to know my undergrad GPA and if I planned to go to grad school, to which I answered, I've already been. They told me they were still interviewing other candidates and would get back to me.
Super chill, don't even worry about it. I enjoyed meeting everyone. It's McDonald's. If you have hands you will probably get the job. Don't worry about it. Don't go in with an attitude. You got this.