Richard, glad it is sorted :)
The door lock is either faulty and/or something is clogged in drain pump/filter.
That is the reason it abruptly stopped and then you were not able to open the door.
You may unplug it and tip it on its side, then access the drain pump from underneath and clean it.
Also check the drain hose where it connects to house drain.
Then select a empty cycle and see how it goes.
If you have any further questions, please do not hesitate to ask!
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