Stopping Moving Objects?

I need a non-moving wall to repel a moving object. Moving script:

 var target : Transform;
 var moveSpeed = 20;
 var rotationSpeed = 5;
 var myTransform : Transform;
 
 function Awake() {
         myTransform = transform;
 }
  
 function Start() {
  
         target = GameObject.FindWithTag("Player").transform;
 }
  
 function Update () {
 
     myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
     Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime);
     myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
 }

I've tried way too many things. I've been stuck on this problem for almost a month. Please respond if you can, I don't really care how. As long as the problem is fixed.