my script not working..!!!

hi guys....please help me...i try to use this script for open the door .... but its not working... i made animation for door and its work..but this not working......please helppppp !!!!

var RayCastLenght = 5;
function update() {

   var hit: RaycastHit; 
      //check if we colloding

if(Physics.Raycast(transform.position, transform.forward, hit, RayCastLenght)) {

                     //...with a door

if(hit.collider.gameObject.tag == "door") {

                      //open the door

hit.collider.gameObject.animation.Play("open door"); } } }