pressing/turning something in VR to do stuff

Hi

I've resolved on my own how to pick up trhings in vr and now I'm trying to make an object that when the contreoller interacts with it performs an action like rotating or play a sound:

public class PlaySound : MonoBehaviour {

 public Rigidbody rigidbody;

 public AudioSource sound;

 private SteamVR_TrackedObject trackedObj;
 private SteamVR_Controller.Device Controller {
     get { return SteamVR_Controller.Input((int)trackedObj.index); }
 }

 void Awake()
 {
     trackedObj = GetComponent<SteamVR_TrackedObject>();
 }

 void Start()
 {
     rigidbody = GetComponent<Rigidbody>();
 }

 private void OnTriggerStay(Collider collider)
 {

     var device = SteamVR_Controller.Input((int)Controller.index);

     // If controller triggers
     if (device.GetPressDown(SteamVR_Controller.ButtonMask.Trigger)) { 
         // play sound
             sound.Play();
         }
     }
 }

Doesn't work of course :(

How can I make the controller activate the script?