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Is it actually heating or do you just hear the fans running and the door is still locked?
OK then unfortunately the door latch isn't your issue, if it's continuing to run after 12 hours you just have a bad main control board. Whether the element relay on the board is stuck so it's heating up the oven and refusing to open the door since it's heating still or the logic in the board is just corrupted---the entire display board would need to be replaced to resolve the issue.
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Yes, just turn the breaker off for now until the part can be replaced and that'll keep you from burning the house down.
OK, if that turns the heat off then you don't have a stuck relay at least.
no problem and good luck to you.