Our 4.5 year old oven door is stuck locked. My son (crafty 1 year old that he is) has learned that if he hangs on the oven door it will come open. He did so today and got it open while I was standing by it. I quicky closed the door and then hit the lock button so that he couldn't get it open. The lock made a noise like it had locked and the little "lock" symbol came on the display but the door did not lock. The oven controls were not operational. We have a slide in model so we couldn't unplug the unit we had to turn it off at the breaker. We did this and let it sit for about 15 minutes then turned it back on at the breaker. When it came back on the lock unlocked, then locked again. Now we can't set the time on the oven. The "door locked" light blinks and none of the buttons except for the oven light is operational. The door is locked shut. What can we try?