You may try using a Victorinox SAK with file and can opener.
Look around for a crack or opening in the shell, maybe at the tip, if there is none then file down the shell a bit to make an opening, stick in the blade of the can opener and pry it open, you may use the small screwdriver bit or the beveled section of the blade or the pointy end of the beveled section, whichever is handy.
Regular "beak" style can openers as in boy scout folders also work but they lack the file.