Add Explosive Force - Coins

Hello,

I have a bunch of gold coins that initiate when I kill an enemy.

I want to be able to have the coins disperse from the kill point (like an mini-explosion), and then after a few seconds, the coins move towards the player.

So I have this function that is called when the enemy die:

 function InitCoins(){
 
     var coins = new Array();
 
     for(var i = 0; i < 5; i++){
 
         var coin : Transform;
         coin = Instantiate(coinPickup, transform.position, transform.rotation);
 
         coin.gameObject.GetComponent(CoinPickup).player = target;
         coin.gameObject.GetComponent(CoinPickup).timer = (i);
 
 
         var radius = 10.0;
         var power = 100.0;
         var explosionPos : Vector3 = coin.transform.position;
 
         coin.rigidbody.AddExplosionForce(power, explosionPos, radius, 10.0);
 
     }
 
 }

The explosion force doesn't seem to do anything? I have the timer and move to player sorted:

 function Start () {
 
     var random = Random.Range(4, 7);
 
     yield WaitForSeconds(timer / random);
     canMove = true;
 
 }
 
 function FixedUpdate () {
 
     
     if(canMove){
 
         var lookPos = player.transform.position - transform.position;
         var rotation = Quaternion.LookRotation(lookPos);
 
         transform.rotation = Quaternion.Slerp(transform.rotation, rotation, Time.deltaTime * 10);
 
         //Move towards player - via transform, or rigidbody
         //transform.Translate(Vector3.forward * speed * Time.deltaTime);
         //rigidbody.AddRelativeForce (Vector3.forward * 10);
 
     }
     
 }

I mainly just want to get the mini explosion effect working to begin with.

Things to note: The game is a top down game, so all Y movements are blocked, as well as X and Z rotations.