Hi and thank you for using Just Answer.
Well, there are a few things you can go through. 1] run your wash through another cycle and see if it would reset it's self and allow the door to open up after completion. If that don't work then 2] power off the machine for 10 minutes minimum. This is no guarantee, but without power it may release the inner lock door switch even if the cycle didn't finish. 3] well this is where you get to do some work ... Final attempt to get to it... Turn off power, unplug at the mains. drag the machine out so you can see the back. Remove the 2 screws that hold the top on, pull back or tap the top forward (depending on the model) to unclip it. Peer inside. You will see the door switch inside the chassis exactly in line with the door handle on the outside. See if you can manually make the mechanism release, or if you have a stubby Philips screwdriver, you can probably unscrew the switch completely. Remember these switches are put in there for safety. So if the switch is deemed bad, please replace it. I wish you the best.