Many decades ago I bought a knife sharpener and received a free gift with it. The sharpener was u/s but the gift was a jar/bottle opener which has stood the test of time and always works.
It is similar to this:
If you're having trouble, a bar-tender once told me, getting the screw-top cap of any bottle, forget the cap: Just hold onto the cap and twist the bottom of the bottle...Leaverage, one of the main principles of physics.