I would have, but my first minimum wage-type job was after high school. I didn’t make enough to pay into CPP, but I don’t know if that’s a universal truth for younger workers or just because I didn’t work more than 10 hours a week.
Also fun fact, going back go my original comment about wage: Saskatchewan’s October increase to its general minimum wage won’t catch up to Ontario’s current student wage. Things are cheaper here, yes, but things aren’t (much if any) cheaper in Saskatoon or Regina than in London.