Proplem in move 3D AR object from point to point at run time

Hi all

I am a new user in Unity and I don't have experience in it. I try create Augmented Reality game, and I have 3D Boy model. I was create Virtual Button and I want when the user click in the Button at run time the boy move at to that button.

I wrote many codes but the boy does'nt move and I dont know what is the proplem . So please if you can help me

this is my code but is not work :(

using UnityEngine; using System.Collections.Generic; using Vuforia;

public class VirtualButtonEventHandler : MonoBehaviour, IVirtualButtonEventHandler {

 // Private fields to store the models
 private GameObject model_Lock;
 private GameObject model_Boy;
 private GameObject btn_1;


 public Transform desPos;
 public float speed;
 Vector3 myPos;
 Vector3 targetPos1;

 /// Called when the scene is loaded
 void Start() {

     VirtualButtonBehaviour[] vbs = GetComponentsInChildren<VirtualButtonBehaviour>();
     for (int i = 0; i < vbs.Length; ++i) {
         // Register with the virtual buttons TrackableBehaviour
         vbs[i].RegisterEventHandler(this);
     }


     // Find the models based on the names in the Hierarchy
     model_Lock = transform.Find("Lock Silver").gameObject;
     model_Boy = GameObject.Find("Timmy_HIGH");
     btn_1 = transform.FindChild("LockButton").gameObject;
     speed = 3f;


     model_Lock.SetActive(true);
     model_Boy.SetActive (true);

     btn_1.SetActive(true);

      myPos = model_Boy.transform.position;
      targetPos1 = btn_1.transform.position;

 }

 /// <summary>
 /// Called when the virtual button has just been pressed:
 /// </summary>
 public void OnButtonPressed(VirtualButtonAbstractBehaviour vb) {
     //Debug.Log(vb.VirtualButtonName);
     Debug.Log("Button pressed!");

     model_Lock.SetActive(false);

     model_Boy.transform.position = Vector3.MoveTowards( myPos, targetPos1, speed * Time.deltaTime);
     model_Boy.transform.position = btn_1.transform.position;

     Debug.Log("Boy Position"+model_Boy.transform.position);
 
     /*
     switch(vb.VirtualButtonName) {
     case "btnLeft":
         btn_1.SetActive(false);
         btn_2.SetActive(true);
         model_1.SetActive(false);
         model_2.SetActive(true);
                 break;
     case "btnRight":
         btn_1.SetActive(true);
         btn_2.SetActive(false);
         model_1.SetActive(true);
         model_2.SetActive(false);
        break;
      //   default:
      //       throw new UnityException("Button not supported: " + vb.VirtualButtonName);
      //           break;
     }
     */
 }

 /// Called when the virtual button has just been released:
 public void OnButtonReleased(VirtualButtonAbstractBehaviour vb) { 
     Debug.Log("Button released!");
 }

}

thank you in advance