Sound on doors

I want my doors to make a sound when ever i open them and the G button is how to open them, how would i make it to where when the button G is pushed make a sound. Heres my current script.

// Smothly open a door
var smooth = 2.0;
var DoorOpenAngle = 90.0;
private var open : boolean;
private var enter : boolean;

private var defaultRot : Vector3;
private var openRot : Vector3;

function Start(){
defaultRot = transform.eulerAngles;
openRot = new Vector3 (defaultRot.x, defaultRot.y + DoorOpenAngle, defaultRot.z);
}

//Main function
function Update (){
if(open){
//Open door
transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, openRot, Time.deltaTime * smooth);
}else{
//Close door
transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, defaultRot, Time.deltaTime * smooth);
}

if(Input.GetKeyDown("g") && enter){
open = !open;
}
}

function OnGUI(){
if(enter){
GUI.Label(new Rect(Screen.width/2 - 75, Screen.height - 100, 150, 30), "Press 'G' to open the door");
}
}

//Activate the Main function when player is near the door
function OnTriggerEnter (other : Collider){
if (other.gameObject.tag == "Player") {
enter = true;
}
}

//Deactivate the Main function when player is go away from door
function OnTriggerExit (other : Collider){
if (other.gameObject.tag == "Player") {
enter = false;
}
}

var aSound : AudioClip;//add this variable assign it while in editor, in the inspector

if(Input.GetKeyDown("g") && enter){
open = !open;
audio.PlayOneShot(aSound);//play the sound once
}
}