Don't worry about it they'll just ask you why you want to work, and look at your background. They're usually hiring people on a daily basis so don't sweat it.
Hiring process was pretty easy. It took about 30 minutes, and all the staff was very welcoming. I recommend getting there at least 15 minutes early. This shows properness and readiness.
Why do you want to work here? What is your past experience? Have you been a cashier before? Situational questions as well as communications and team work effort sand ethics.