See the dealer.
how to replace ignition lock for 1999 vw beetle
How do you remove the driver side door panel of a 1998 VW Beetle to replace the door handle cable?
how do i replace a trunk lock with another lock that has a key
The lock is under the VW emblem -- I believe it turns counter-clockwise.
If it is like most other VWs , there is a Philips screw on the edge of the door where it latches. if this is removed the door handle can be slid out. You didn't mention if there is a key lock in the handle. Use the key in cylinder from the old lock to replace. You may also have to turn the key in order for the slot to mate in the door mechanism.
Unfortunately, if your locking mechanism has failed there is no way to open your trunk alone. You will need to go to a mechanic so they can replace the lock.
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I am facing the same problem with my 2003 Beetle. Some have suggested drilling a smail (1/16") hole in the slider and using an awl to move the slider lock up. Others on a model year I don't recall, removed the assembly to get into the slider lock assembly. Good luck! See also: http://www.cindyli.com/index.php/site/comments/vw_beetle_headlight_replacement/
how do you replace rear door lock assembly on 92 pONTIAC tRANSPORT
Locksmith should be able to do this
Replace the lock.
To replace a sliding door lock, first remove the old lock by unscrewing it from the door. Then, install the new lock by following the manufacturer's instructions and securing it in place with screws. Test the new lock to ensure it functions properly.