2D platformer levers and moving platforms question.

Okay, so I thought I submitted a question, but must have done it wrong and I apologize. I am trying to make a 2D platformer where a player can jump into levers and move corresponding walls. Below is my code which causes unity to lock up. It is the while loop. It apparently never changes wall.transform.position. Can somebody please explain why this is so and how I can fix this?

If any more details are needed, please request them and I will respond asap.

using UnityEngine; using System.Collections;

 public class lever : MonoBehaviour 
 {
     
     public GameObject leverControl;
     public GameObject wall;
     public GameObject startLocation;
     public GameObject endLocation;
     
     private Vector3 start;
     private Vector3 end;
     private bool wallUp;
 
     // Use this for initialization
     void Start () 
     {
         start = startLocation.transform.position;
         end = endLocation.transform.position;
         wallUp = true;
     
     }
     
     // Update is called once per frame
     void Update () 
     {
     
     }
     
     void OnCollisionEnter(Collision Player)
     {
         if(Player.gameObject.tag == "Player")
         {
             if(wallUp)
             {
                 while(wall.transform.position != endLocation.transform.position)
                 {
                     end = wall.transform.position;
                     end.y -= .05f;
                     wall.transform.position.Set (end.x,end.y,end.z);
     
                 }
                 this.transform.Rotate(0,90,0);
                 wallUp = false;
             }
             else
             {
                 while(wall.transform.position != startLocation.transform.position)
                 {
                     start = wall.transform.position;
                     start.y += .05f;
                     wall.transform.position.Set(end.x, end.y, end.z);
                 }
                 this.transform.Rotate(0,-90,0);
                 wallUp = true;
             }
             
         }
     }
     
 }