Trunk lock broke - how to open the trunk?

I use my foot and a pad with my back against the door jamb for the seat bottom. Push in and then upward a bit. Remove.
Un-bolt the seat back. Remove.

Peen the end of a rod length into a screwdriver type flat on one end and bend a short 90° on the other. Grab a flashlight and play hit the slot a couple minutes. Once in the slot give it a twist in the right direction. Tadaaaaaa!