OnTriggerEnterinputLight

Hello, I've created a script (it works though) which is for a trigger light on input, and the thing is, when I wrote this script I never managed to put the same input button for the light to turn on or off, its 2 diffirent buttons. And what I want is one SINGLE button for On and Off, anyone can help me out with that?

 {
     public Light taklampa;
     private bool Sam;
     private bool text;
 
     // Use this for initialization
     void Start () 
     {
         taklampa.enabled = false;
         Sam = false;
         text = false;
     }
     
     // Update is called once per frame
     void Update () 
     {
         if (Sam == true && Input.GetKeyDown (KeyCode.E))
         {
 
             taklampa.enabled = true;
 
 
         } 
         else if (taklampa.enabled == true && Sam == true && Input.GetKeyDown (KeyCode.T))
         {
             taklampa.enabled = false;
 
 
         }
 
 
     }
     void OnTriggerEnter(Collider other)
     {
         Sam = true;
         text = true;
     }
     void OnTriggerExit(Collider other)
     {
         Sam = false;
         text = false;
     }
     void OnGUI()
     {
         if (text == true)
         {
             GUI.Box(new Rect(350, 100, 400, 100), "Press E to Turn On & T to turn Off");    
         }
     }
 }

thanks in advance.