Paint can opener, particularly the small variety that has a blunt edge only, and no sharp edge. Paint stores often toss them in free with a purchase. Failing that, they only charge a quarter. "Course you could just use the quarter in the first place.
If that fails, back the car out of your garage. stand back from a wall, take a stance and look in for the sign, hold said tin in your curve ball grip, go into a stretch delivery following through by bringing your hand down sharply to get a nasty spin. Retrieve now open tin and move the contents into a suitable Ball jar. (That's why it's called a Ball jar, in case you didn't know.)