If you’ve ever examined a tin of Kiwi saddle soap or wax shoe polish, you’ve probably seen the cleat-looking thing shown in the photo. You might also have noticed that the lid is damned hard to get off with your hands alone.
What might not have been obvious to you (hence its inclusion on this site) is that that cleat is actually the opener for the lid. It turns, and turning it far enough will pry the lid off of the tin. The photo demonstrates.