Self-cleaning ovens operate at such high temperatures, that the safety lock engages until the internal temperature returns to a safe level. In many cases, the oven won't begin the cleaning cycle unless the door is in place and the lock is engaged.
According to Viking appliance company, self-cleaning oven temperatures get between 850 to 900 degrees Fahrenheit, which is hot enough to turn food particles to ash.
Although the length of the clean cycle may depend upon your particular model, many ovens run for about 3 to 3 1/2 hours. After the cleaning cycle turns off, it normally takes 30 to 60 minutes before the door lock disengages.
If it has been over an hour, and you suspect the lock is broke, turn off the appropriate circuit breaker for at least 5 seconds and then try to open the door again. Turn the clean cycle on one more time, allow it to work for about 15 minutes, and then cancel the setting. Wait until the oven cools down, and then open the door one more time. If the lock still doesn't disengage, you may need to manually open the door.
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