Sadly the model number is on a rating plate inside the door on the leading edge of most from memory.
There is a lock in most that slides across the top edge of the door, if you can get to it push the catch to the right as you look at it (from memory I could be wrong) and that should release the door.
It should have released after that length of time so my guess is it’s a failure in the lock. Total pain as the screws that hold the appliance in are behind the bit you have to open.
K.