Typically, people go through two interviews. Because I went through a recruiter I had three interviews. They also require a drug test and they won't hire any one under 18.
I was first contacted by a recruiter and interviewed with them twice. I then interviewed with the store manager. They asked the basic interview questions: why would you be a good fit here, where do you see yourself in 5 years, etc. With the store manager I did a "rehearsal", where I greeted a customer and helped them for a minute or two. They do this to see how you interact with customers, especially if you don't have any prior experience (which was my case at the time).