I have the same problem on my second 2004 coupe. Can't open hatch . An unnamed family member used key fob and hatch handle simultaneously repeatedly trying to unlock the hatch. Now the handle has no resistance, will not unlock. You can hear it trying. I cannot crawl in the back due to an injury, so I need in from the outside. Previously I had removed all the inside coverings in the hatch, so I can see the mechanism from the inside but can't reach it.

I removed the plastic lens to drivers side (US, not UK) license plate light, but there is no apparent access with a slim screwdriver. Is there a way to remove the housing and get further in? I tried to pry the surrounding seal off, but cracked it trying, so stopped.
How to proceed? Thanks