Operator # Has been locked out?

I work at walmart and today my operator number was locked out of the system for running cash registers. I hadn't had an incorrect punch all day. I came in at 9 am and opened the photo lab as instructed. Then I have an opening shift tomorrow and will be the only one working in the photo lab until 5 pm tomorrow. I doubt if I have cbls to do so I'm kinda curious as to what has happened.