I have the same problem with my 1997 LX wagon.
You have to get the hatch or trunk open (mine was a bit of a trick because the lock prevented the pull rod & power actuator to unlock the mechanism, I finally got into it by being tenacious). Once the hatch is open, take off the panel and pull away the plastic film to get into the hatch cavity.
Then, there is a wide flat clip that you have to pull out sideways. I used a long broad screwdriver and a hammer and tapped it from behind. Once that is off the lock body can come right out. Carefully unclip it from the rod and it's out.
Now here's my question: where can I get a replacement lock cylinder???
The locksmith didn't have one, then the jobber store didn't have anything, Rockauto.com didn't have it, nor did the dealership and in fact the guy told me that part was only available as part of a collection of 1 ignition lock body, 2 door lock bodies, and 1 hatch lock body; but it had been discontinued.
????
So now what? Auto wrecker or something?
Any help greatly appreciated.