Ove corse you need to make sure your oven is or has cooled down and turn the breaker off for good measure I had this problem. I think the locking unit is jumping gears because i hear a grinding sound when Mine locks. The way I got mine open was, Lookalong the top of the oven door. there are vent slits cut in the top, if you look in them where the latch is you will see the hook that is holding the door shut. I took a butterknife ( you need something flat and strong because of the angle yu have to hold it at. take the knife and push the hook to the left. I will take a few tries but it should pop open. once it is open and power is restored the latch will retract to its normal position. hope this helps
Look for a manual lever to unlock the oven. If there is one, it will probably swing back and forth horizontally, just below the upper edge of the oven door.
Swing the locking lever, if one is present, all the way to the left. This should unlock the oven. If there is no manual lever to unlock the oven, it may be unlocked using push-button controls.
Check to see if the oven is in a self-cleaning cycle, or has just completed a self-cleaning cycle. If so, the door will unlock automatically once the oven has finished the cleaning cycle and cooled completely, which may take several hours. You cannot unlock the oven before it has cooled.
Unlock the "Clean/Off" button. Depending on the brand and model of your oven, the button may display both of these designations or just one. If your oven door is locked, but the oven is not warm and is not in a cleaning cycle, unlock it by pressing and holding the "Clean/Off" button.
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