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One moment while I get some information for you!
You need to get something flexible like a stiff piece of plastic or metal and slide it in between the door and frame and slide it sideways to hit the latch hook and press it to the left or right and open the door that way manually. Most latch hooks you will slide the piece from right to left pressing the latch hook left to release it...90% are like that, the others are the opposite way depending on make and model.
Without power to the unit and without a way of sliding it out you are going to be stuck trying to jimmy the door open. I just did one yesterday same issue. I actually use a metal slim jim to get between the door or into the grate area of the door lock mech to push the lever to get the door open. I am not sure what more I can tell you on this I can open this up for other experts to comment on though for you.
I work on Dacor units for a living you do not need brute force to open them, but you do need patience to try and fish the door lock open. Wait for another expert as I do not think I am a good fit to help you on this. Just standby for another expert. Thanks