I usually try to do the self checkout when I go to the supermarket because I want to get in and out as quickly as possible. Often I don't meet my goal. One of my items scans incorrectly or I can't scan it at all. Sometimes the machine stops working altogether. I end up having to flag down an employee to fix one problem or another and I swear to myself that next time I'm going to get on a regular line manned by a real live cashier. I guess that's why self checkout hasn't caught on with most people, or at least not enough people to cause a problem for those looking for jobs. The US Bureau of Labor Statistics predicts there will be more job openings for cashiers than for others through 2020.
Working as a cashier can be a good job for those with little training or for students who want a part-time job while going to school. Given the number of job openings, you can get a job pretty quickly. Be aware, though, that the pay is pretty low. Read Cashier: Career Information to learn more about this occupation. Get a job description, find out where cashiers work, learn about earnings and see what a typical day at work is like.