Ive created a model in maya its a lantern that has an animation, a door that swings open, ive saved it and imported it into unity and all works well, the animation currently just opens the door id like it to then close (play the animation in reverse), ive found a good answer to this 
1 Answer
1You can do Ping Pong for Once
tried to apply ping pong to wrap mode but it doesnt seem to work, thanks for the heads up though hadnt heard of this before
– martipello