My speed Powerup doesnt decrease after a duration

Hello, I have a speed Powerup and when i collide with it my speed goes from 3f to 5f after a duration(3f) the speed should go down to 3f

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 
 public class EnergyCollection : MonoBehaviour
 {
     public float Duration = 3f;
     public float plus = 2f;
     public float minus = -2f;
     private void OnTriggerEnter2D (Collider2D other)
     {
         if (other.CompareTag("Player"))
         {
             StartCoroutine(PickUp(other));
         }
     }
 
     IEnumerator PickUp(Collider2D player)
     {
         movement Spppeed = player.GetComponent<movement>();
         Spppeed.speed += plus;
 
         GetComponent<SpriteRenderer>().enabled = false;
         GetComponent<BoxCollider2D>().enabled = false;
 
         yield return new WaitForSeconds(Duration);
 
         Spppeed.speed -= minus;
 
         Destroy(gameObject);
     }
 
 }
 

But my speed stays at 5f pls help