I credit an undergrad summer job in door-to-door sales for moving my social skills from "terrible" to "good". For that particular job we literally had a points system that was visible to everyone in the office (and determined incentives like fully-paid vacations abroad), and you'd sell enough on a daily basis that you knew roughly how you were doing (ie 5 sales was a decent day, 10 outstanding, 2 bad, out of perhaps 100 interactions), so it was a near-perfect training ground.