Freeze Rigidbody

Hi, I want to make a script so that i can freeze the X, Z rotation and the Z position. But when I attach the script to my gameObject it won't work.

Here is the script so far.

 var target : Transform;
 function Start () {
 }
 function Update () {
 
 }
 function OnTriggerEnter (col : Collider) {
 
 if(col.gameObject.tag == "mijnobject") {
 GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.FreezePositionX;
 GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.FreezePositionY;
 yield WaitForSeconds(0.1);
 this.GetComponent.<ConstantForce>().force = Vector3.right * 60;
 this.GetComponent.<Rigidbody>().useGravity = false;
 GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.None;
 GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.FreezePositionZ;
 GetComponent.<Rigidbody>().constraints = RigidbodyConstraints.FreezeRotationX.FreezeRotationZ;
 
         }
     }