560 sl trunk will not open

I have 1989 560 sl and went to town to pick up a new ceiling fan for the room of my oldest son. It fit easily in the trunk, but fitting the car cover in with it was a bit of a challenge. I was able to move things about and the trunk seemed to close easily, but I am now unable to open the lid. I am able to unlock the lid mechanism and when I push the button there is some contact but the lid will not open. When I then push the lid down there is a definite click as if the mechanism is re-seating. Multiple attempts have failed to result in the trunk opening. Any similar experiences? Solutions?

Have you tried pushing the lid down while turning the key and/or pushing the button?