strange behaviour for coroutine and invoke

something strange is happening and I don't know why. All I'm trying to do is set a bool and a light for 5 seconds. It works the first time its activated but all subsequent times it only stays active for about a second. These are the 2 ways I tried it but had the same problem:

  void OnTriggerEnter2D(Collider2D col)
 {
 invinsable = true;
 
  foreach(Light light in lights)
           {
               light.enabled = true;
           }
 Invoke("SetBoolBack", 5f);
 }
 
 private void SetBoolBack()
 {
     invinsable = false;
               foreach(Light light in lights)
           {
               light.enabled = false;
           }
 }

and here is my coroutine attempt:

   void OnTriggerEnter2D(Collider2D col)
  {
  invinsable = true;
  
   foreach(Light light in lights)
            {
                light.enabled = true;
            }
              StartCoroutine(Invincible());
  }
 
 IEnumerator Invincible() 
 {
     while(true) 
     {
         yield return new WaitForSeconds(5); 
    invinsable = false;
               foreach(Light light in lights)
           {
               light.enabled = false;
           }    
     }
 }