To open a dishwasher door stuck closed, first make sure there is no lock keeping the door closed. Some dishwashers have a child lock or control lock, which will prevent the door from opening. If a lock isn't the cause, you will need to manually open the door using a pair of vice grip pliers and an Allen wrench. Slide the Allen wrench along the top and use it to locate and lift the door's latch. If it seems difficult to you I recomment you better hire professional dishwasher technician