Can't open trunk '87 4000CS

[Leon]

I recently bought a fairly decent looking 4000CS in Denver, and it for
sure does have a lot of the common problems(next thread), along with a
trunk that doesn't want to open. There are lots of spare parts in the
trunk, so go figure why I need them :P
When I first had a look at the car, I couldn't get the trunk open, I
asked the owner and he showed me a trick to get it open.
It was by inserting the key, push it in slightly, turn it to the
right, press in the key(or lock cylinder) and jank open the trunk -
this for sure did work, I tried it several times with no problems.
Now it wont open at all. The key hole is vertical (meaning locked,
default position, it never did go completely horizontal when opening,
maybe off by 20 degrees), I can turn it a bit to the right, press it
down for the opening mechanism, but it will not engage and open up. It
also seems that the trunk is not completely closed, as there is some
play.
My question is: can i go trough a tail light (one is broken, so no
problem), punch it in with a screw driver, or drill it out? I realized
that the trunk is a big plastic molding piece and there is no way to
go through there, unless I missed it. Rear speaker holes... I had a
look trough them, but my hands wont be able to fit trough there...

Any suggestions, insider knowledge or previous experiences on opening the trunk?

David