how to make a script when an object collides with an object it makes another object rise

I'm trying to make it so when I shoot a target the target is destroyed and I have a blocker raise up to unlock a separate area. I can't get it to make the other object rise, but I have the target disappear. This is what I have so far:

void OnCollisionEnter(Collision theCollision){

     if (theCollision.gameObject) {
         Destroy (gameObject);
         RaiseBlocker();
     }
 }

 void RaiseBlocker(){
     curMoveProportion += (Time.deltaTime / moveTime);
     if(curMoveProportion >= 1){
         if(targetPos == targetPos1){
             targetPos = targetPos2;
         } else {
             targetPos = targetPos1;
         }
         prevPos = transform.position;
         curMoveProportion = 0;
     }
     transform.position = Vector3.Lerp(prevPos, targetPos, curMoveProportion);
 }