I have created a script that move a door, you can alter to rotate: Some variables are in portuguese (I'm from Brazil, sorry), but I explan each one:

Person: The character that you control.

Distancia: Min distance to open door.

toWhere : To where the door would move e.g:.

Up x:0 y:2 z:0,

Left: x: -5 y:0 z:0

Misc: x:5 y:2 z:-3

velocidade: Velocity

var person : Transform;               
var distancia : float;                        
var toWhere : Vector3;                
var velocidade : float;

private var iniPosition : Vector3; 
private var endPosition : Vector3; 



function Start(){
                iniPosition = transform.position;
                endPosition = iniPosition+toWhere;
}


function Update () {


                var dist = Vector3.Distance(person.position, iniPosition);


                if(dist < distancia){
                               transform.position.x = transform.position.x+((endPosition.x-transform.position.x)*Time.deltaTime*velocidade);
                               transform.position.y = transform.position.y+((endPosition.y-transform.position.y)*Time.deltaTime*velocidade);
                               transform.position.z = transform.position.z+((endPosition.z-transform.position.z)*Time.deltaTime*velocidade);
                }else{
                               transform.position.x = transform.position.x+((iniPosition.x-transform.position.x)*Time.deltaTime*velocidade);
                               transform.position.y = transform.position.y+((iniPosition.y-transform.position.y)*Time.deltaTime*velocidade);
                               transform.position.z = transform.position.z+((iniPosition.z-transform.position.z)*Time.deltaTime*velocidade);
                }

}

You don't need a RayCast for that. You can use a simple distance check:

var triggerDistance:float=5;
if((door.transform.position-transform.position).sqrMagnitude<triggerDistance*triggerDistance){
    // check for key event etc.
}

(Note you should always use sqrMagnitude and the square in the comparison, instead of magnitude, due to performance reasons)

Another method would be to create a collider around your door, and only test for the key event if the player is inside that collider:

function OnTriggerStay(other:Collider){ // not sure if that's the correct function - check the manual/tutorial/examples
    // check for key event etc.
}

A note regarding your code, you always cast your ray straight forward, so you will only get a hit if you actually directly look at the door(-collider), which might be the reason your code doesn't seem to work.

I try it but it dosn't work with me. i'm new with scripting in unity so i found a problem to write a script. Thanks for your help