Ok what you will find is its more then likely the door handle has broken.
There 2 ways you can get the door open on these. The first is get a piece of string and feed it into the gap around the outside of the door at the top.
Then feed the string around the door going round the handle until both ends are opposite the door handle.
Now pull on the string at the same time pull the door handle and that should open the door.
But if that way doesn't work then what you need to do is remove the top of the washer and from there look down the inside of the washer on the right hand side. There you will see the door lock.
Make sure the washer is unpugged and then reach down there and feel the lock.
On the left hand side is the door pin poking through. You may not see it but you will feel it.
Push this pin to the left and at the same time pull the door and that will open it.
Once you have the door open then you can replace the door handle from there.
If you need anymore info just get back to me.