VW MK4 1998 Locking Problem?

I have been having a problem recently where when I used the key to open the drivers side door it would be very loose and not always open the doors. After several turns most times it would unlock and the windows would all wind down.

Now I cannot use the key to lock the door but I can use it to unlock the door. Is this something that any garage can fix or will I have to take this to a VW dealer or VW specialist to get fixed?

Thanks