Im having a Problem with Basic Collision.

Hello! Im trying to make an basic controller. Im using 2D objects in the 3D plane. The issue that I have been having is that I cant get my objects to collide with a basic Box Collider. I have tried everything from using OnTriggerEnter/OnTriggerStay/OnCollisionEnter/....etc but have had no success. However whenever I use CharacterMotor the objects collide and stop.

What I need is a script that when the object hits a box collider it stops and doesnt keep going.

The Script I have been using for Movement

var speed = 5;

var player : Transform;

 function Update () 
 {
 
 
 
  if (Input.GetKey(KeyCode.W)) {
      var PositiveForward : float = Time.deltaTime * 10;
      transform.Translate(0 , 0, PositiveForward);
      
     transform.eulerAngles.x = 0;
     transform.eulerAngles.y = 0;
     transform.eulerAngles.z = 0;
     
     
     }
      
  if (Input.GetKey(KeyCode.D)) {
      var PositiveZ : float = Time.deltaTime * 10;
      transform.Translate(0 , 0, PositiveZ);
      transform.eulerAngles.x = 0;
     transform.eulerAngles.y = 90;
     transform.eulerAngles.z = 0;
 }
 
 
 
 if (Input.GetKey(KeyCode.S)){
      var Backward : float = Time.deltaTime * 10;
      transform.Translate(0 ,0 , Backward);
     transform.eulerAngles.x = 0;
     transform.eulerAngles.y = -180;
     transform.eulerAngles.z = 0;
 
 }
 
 if (Input.GetKey(KeyCode.A)){
      var Left : float = Time.deltaTime * 10;
      transform.Translate(0 , 0, Left );
      transform.eulerAngles.y = -90;
 }
 
 
 }
 

Im honestly lost im not the best when it comes to coding.