clean light won't go off/dishwasher won't start

Frigidaire Dishwasher. The clean light is on and will not go off. We have opened the door several times but the light continues to stay on. I tried to start the next load of dishes but it will not start. It seems as though, trying to start the new load caused another problem because the "Control lock" light in now on. This dishwasher was here when we bought this house, so I do not have any manuals or any paperwork. We have been here three years. Not sure how old the dishwasher is i would say maybe 4-5 years old. Would greatly appreciate any help you could provide.