Manchester United survived an almighty scare to progress to the FA Cup final on penalties after Coventry fell agonisingly short of a sensational comeback win at Wembley.Sky Blues captain Ben Sheaf sent the crucial kick over the crossbar leaving Rasmus Hojlund to win it, but the game will be remembered for three goals in the final 20 minutes by the Championship side as they recovered from 3-0 down to force extra-time.