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The problem you are having is the door lock inside the door is broken. You will have to replace it.
Most of the time if you just firmly grasp the door you should be able to force it open
Just give it a good yank
Once you get the door open you will need a star bit screwdrive to take the inner panel out so you can replace the latchclick here for videoThe panel is showing how to replace the computer board, but it is the same steps for replacing the door latch.
Here is a link to purchase the part if you want to do this yourselfclick here for part
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