activate an inactive GameObject with yield return new WaitForSeconds doesnt work

Hi,

I have the issue that an Object I set to inactive , wont get active again with yield return new WaitForSeconds.

What do I do wrong here? I call the IEnumerator Activate function but I cannot reach the code after WaitForSeconds?

Please help! I am struggling with this since two days and I tried so much already... I am out of ideas. Thanks!

     public GameObject docu;
     public GameObject document;
     public GameObject reticle;
 
     private void Start()
     {
         reticle = GameObject.Find("UI/ReticleCanvas/Reticle");
         document = GameObject.Find("UI/Stats/Document");
         docu = GameObject.FindGameObjectWithTag("Docu");
     }
 
     private void OnTriggerEnter(Collider other)
     {
         if (other.gameObject.tag == "Player")
         {
             Destroy(docu);
             document.SetActive(true);
             Deactivate(reticle);
             Destroy(document, 5);
             // Code works perfectly until here!
 
             StartCoroutine(Activate(reticle));
         }
 
     }
 
     void Deactivate(GameObject g)
     {
         Debug.Log("GO INTO DEACTIVATE FUNCTION AND DEACTIVATE RETICLE!");
         g.SetActive(false);
     }
 
     IEnumerator Activate(GameObject g)
     {
         Debug.Log("GO INTO ACTIVATE FUNCTION!");
 
         // my trouble maker :(
         yield return new WaitForSeconds(5);
         Debug.Log("ACTIVATE RETICLE AFTER AFTER 5 SECONDS!");
         g.SetActive(true);
     }