problem with keyboard focus on box

Hello there! my problem is quite simple, im displaying a box on screen, which has a GUIStyle and i put in 2 textures, one for the "normal" stance, and one for the "focus" stance. When i press the action button (say, Z ) i give focus to the box, and i expect it to change the color of the box from the normal stance to the image on the focus stance, but nothing happens. I wrote a debug line to show if its properly giving focus to the box and indeed it is, here is the code:

 public GUIStyle aStyle
 void OnGUI(){
 
     GUI.SetNextControlName("hello");
     GUI.Box(new Rect(500,250,500,100),"asd",aStyle);
     if(Event.current.Equals(Event.KeyboardEvent("z")))
     {
         GUI.FocusControl("hello");
         print(GUI.GetNameOfFocusedControl());    
     }
 }

Im kinda confused about why isn't showing properly , i searched and tested alot of things, and got nothing. Thanks your reply!

PS: now that im here, i was wondering if is there a way to use the keys from the InputManager to use in the Event.KeyboardEvent() since im not very confortable using the actual key instead of the ones in the input manager. Thanks