This decision is completely player dependent. Against a crazy player, I won't mind calling the flop and calling his all in on the turn (because I think 80% of the time, UTG is pot-committed already). If this guy is pretty tight-aggressive, I'll give him credit for the set, because there really isn't another hand that he should have, except AK (and that's not likely since he limps UTG).

That being said, it's probably impossible to give a correct answer without a read.