void OnTriggerEnter(Collider other)
 {
     if (active & other.tag == "Player")
     {
         GrabKey gc = other.gameObject.GetComponent <GrabKey>();
         NotificationScreen.getInstance().displayNotification("Obtained key to cage!", Time.time, 3);
         AudioManager.getInstance().playObtained();
         ScoreSystem.getInstance().addToScore(50, ScoreSystem.scType.NONE);
         gc.giveKey();
         active = false;
     }
 }
 void OnTriggerEnter(Collider collider)
 {
     if (collider.gameObject.tag == "Player" && doorController.IsDoorClosed)         // this string is your newly created tag
     {
         GrabKey gc = collider.gameObject.GetComponent <GrabKey>();
         if (gc.nKeys > 0)
         {
             print("Opening the door");
             doorController.OpenDoor();
             gc.nKeys--;
         }
         else
         {
             NotificationScreen.getInstance().displayNotification("You must find the key to the cage!", Time.time, 3);
             print("Can't open the door");
         }
     }
 }