Self cleaning oven door lock is stuck and buzzing

Question

My daughter opened the oven door near the end of the self cleaning stage and now the latch does not move back. The oven door buzzes when opened and there is smoke coming from the top of the control panel, as if something is overheating. We ran the cleaning cycle for another two hours and when it was done, the latch still did not switch back. Can I still use the oven until we get a repairman in? Does it sound like the locking mechanism is broken? The range is about five years old and is a Whirlpool Gold from Sears