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If the door wouldn't lock it means that the oven thinks it's in the middle of the locking process. Try to flip the circuit breaker off on your house for the oven for 5 minutes. Flip the breaker back on and see if the oven will reset. If not then unfortunately the door latch would need to be replaced before you can use your oven again I'm sorry to say because it's stuck somewhere between the opened and closed position so it's not sure whether it's safe to heat or not.
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