My dad has been retired for 3 years now. He worked in a woodworking shop with around 25 employees for a little over 30 years, yet never in his life made $20/hr except for overtime.Your employer has to pay the new people at least $15/hr to keep them there, even if they are an idiot. I can't imagine that work ethic and experience is only worth $20/hr.
I work in a small, independent auto repair shop where I've been for 14 years (24 years total experience) I'm paid exactly $25/hr for the work that I perform, not for being there. I've got around $130k invested in tools. If someone hired in with $2500 worth of tools, 2 years at a tire shop, dumb as a door stop and zero work ethic, then was paid only 20-25% less than me, I wouldn't feel like the effort I've put forth was worthwhile.
In fact, I would feel it entirely unnecessary to teach my child about working hard and paying his dues. Then, I'd ask my boss for a 40% pay increase to match everyone else. When he explains that he can't possibly afford that after he starts paying the dummy $15 an hour, I could just quit and try to get on the draw.