Try turning your selector dial to the '!' mark and press the start button. This is just to clear any remaining part of the programme in the memory.
Give it say, 3 to 4 minutes then press the front of the door frame near the handle, now squeeze the release lever.
If this doesn't work-unplug the machine. The door locking bolt will be deprived of power and the bolt should withdraw. If it doesn't, the release bolt has jammed or broken.
At this point you are allowed to shout and scream but it may be better to take off the lid and disassemble the lock.
For parts (approx £11-49)Go to www.espares.co.uk and when there click on the Advice Centre tab click washing machines in the drop down menu >click on page 3 and then read item Nos 2 & 3.
GB in Wales, March 2013