My wife Said she goes by the misting system and gets her fingers wet then gets the produce bags. I just put between both hands and rub my hands it opens the bag at least to see the opening.I have a similar problem with my former "Vise Grip" grip failing, needing a bright light and a magnifier to see fine detail, and keeping nails ultra short to prevent breaking. I get frustrated in the supermarket trying to open a simple plastic bag to put my produce in.
A simple solution to the tin from hell would be to put a couple of self tapping screws in the sides; one on top and one on the bottom to provide a pry point.