I own a used 2001 Skoda Fabia and ever since I bought it the passenger side door hasn't worked properly. I took it to the mechanic after I bought it to get a tune up and he gave it a swift pound and it opened. That worked for a while but now its jammed again and it won't open at all. I've disassembled the door and the outside and inside handles are both pulling like they should. However it's not lifting the hook that holds the door closed. Any suggestions?