Create GameObject On Click Not Working

Can you guys please help with my code. I have made this code which is made so that when the menu button on the VIVE is clicked, a new game object is spawned. For some reason, even though there are no errors, the code does not work. Please help me fix this code.

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 
 public class CreateBallOnPress : MonoBehaviour
 {
     public GameObject Ball;
     public Vector3 BallValues;
     private Valve.VR.EVRButtonId menuButton = Valve.VR.EVRButtonId.k_EButton_ApplicationMenu;
 
     private SteamVR_Controller.Device controller { get { return SteamVR_Controller.Input((int)trackedObj.index); } }
     private SteamVR_TrackedObject trackedObj;
 
 
     void Update()
     {
         Vector3 BallPosition = new Vector3(BallValues.x, BallValues.y, BallValues.z);
         Quaternion BallRotation = Quaternion.identity;
         if (controller.GetPressDown(menuButton))
         {
             Instantiate(Ball, BallPosition, BallRotation);
         }
 
     }
 }