Hi,Welcome to Just Answer, My name isXXXXX will be helping you with your appliance issue today.
this is a tough one, the latch/lock assembly has failed. these are hard to open when they are locked, first thing to try is shut the breaker off for 5 minutes then turn it back on, see if it unlocks, if not you will need to make a hook out of a coat hanger and get it into the door and pull the hook over to the left and try to get the door open that way, once you get it open you will need to replace the latch assembly, here the diagram of the latch assembly, you can see the latch hook in the diagram,if you cant get it open you will need to call a tech unfortunately.
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No need for your help, as I found the user manual, which advises that you should remove the top to access the upper latch. There are two bolts holding the top down at each corner, a 9mm open ended spanner will remove these. Once the top was off I could see a lose connection to the switch. I repaired and tested the connection, all okay and range cleaning is continuing on the upper oven.
You can use my explanation for removing the top cover as what you suggested using a coat hanger to pull on the latch would never work as there is a cam which rotates to lock the latch.
Perhaps you could get hold of the user manual for a better idea as to solutions.
Please confirm that I will not be charged as I did not require your help, which turns out would not work anyway.
You can with an open ended spanner as they are Hex heads.