collider then change rotation converse?

hi!I want to let my player move converse after he touch a box colider.

that my scripts:

 public float WalkSpeed=5F;
 public float RunSpeed=10F; 
 public float rotationmove=1;
 void Update ()
 {
 AutoWalk();
 if(Input.GetKeyDown(KeyCode.P))
 {
 Run (); 
 } 
 if(Input.GetKeyUp(KeyCode.P))
 { 
 Walk(); 
 animation .Play ("walk"); 
 }
 void AutoWalk()
 {
 animation.Play("walk");
 controller.SimpleMove(Vector3.right * WalkSpeed); 
 } 
 void Walk()
 { 
 animation.Play("walk"); 
 WalkSpeed=5; 
 RunSpeed=WalkSpeed;
 RunSpeed=10; 
 } 
 void Run() 
 { 
 //controller.SimpleMove(Vector3.right * RunSpeed); 
 WalkSpeed=RunSpeed; 
 runtime=Time.time; 
 animation .Play ("run"); 
 }
 void OnControllerColliderHit(ControllerColliderHit hit)
 {
 if( hit.gameObject.tag =="Door")
 { 
 Destroy(hit.gameObject); 
 WalkSpeed=WalkSpeed*rotationmove; 
 RunSpeed=RunSpeed*rotationmove; 
 }
 }