depends if plastic or metal lock. If plastic I'm not sure but( maybe bus
depot not sure if all the same)  if metal lock take out the 4 screws unhook
the clamp on the water line. There are lock tab's on the nut that holds the
lock down flatten those out and take nut off the lock will come out, you
then can take it to a lock smith and have a key made for it. The key mine
used was a ILCO-1092c I think they have to cut the end short for it to work