Since thingiverse can never have sufficient bottle openers...
Here is an openscad wall socket penny jar opener.
The scad file is parametric though you'll have to play around to see what works. It's not commented at all and rather badly written...
There's currently a first attempt at a version with a tongue and eyes. I haven't printed it though. You may turn it off and on using a boolean in the scad file.
Print it out, clean if necessary.
Insert penny (you might need to squish it in with pliers). The previous version I printed out was a bit too tight so I made the hole somewhat larger. Hopefully it isn't too large. I haven't printed it out yet.
Screw it to the wall (or whatever).
You'll want pretty secure screws as there's quite a lot of force trying to rip it off the wall.