The oven will not work.when try to turn it on ,the words- UNLOC DOOR,appears on oven.What has caused this to malfunction,and is there a way to correct it?

Try opening the door and press the light switch that the door makes contact with when it's closed. Hold the switch for about ten seconds. Sometimes the door gets opened before the clean latch is fully opened and the door can't make contact with the switch again.
Pipemaster17