Destroy Clone Game Object On Collision Doesn't work

Hey Guys,

I'm trying to make Block Breaker game. Now, I'm trying to create random power ups as a chance %5 when a block is destroyed.

This is where I instantiate a game object randomly.

 public class BlockSquare : MonoBehaviour
 {
 [SerializeField] GameObject specPow;
  public GameObject spcPow;
 
 public void SpecPowInstantiate()
     {
         int randomNum = UnityEngine.Random.Range(0,20 );
         if(randomNum == 10)
         {
             spcPow = Instantiate(specPow, transform.position, transform.rotation) as GameObject;
             Destroy(spcPow, 5f);
         }
         
 
     }
 
 
 
 }

This is where I tried to destroy clone gameobjects. But I couldnt :

 public class Paddle : MonoBehaviour
 {
    BlockSquare blckSpecPow;
 
    private void OnTriggerEnter2D(Collider2D collision)
     {
         if(gameObject.tag == "SpecPowGameObject")
         {
             Destroy(blckSpecPow.spcPow);
         }
 
         
     }
 }