,GetButtionDown show Texture on screen HELP

,so i want when you press Ctrl it displays a texture than when you press it again it will go away

This is what i have but it does not work im trying to put those together (I'm still a beginner)

 public class Texture_Script : MonoBehaviour{
 
     if (Input.GetButtonDown("Fire1"))
 
     public Texture aTexture;
     void OnGUI() {
         if (!aTexture) {
             Debug.LogError("Assign a Texture in the inspector.");
             return;
         }
         GUI.DrawTexture(new Rect(10, 10, 60, 60), aTexture, ScaleMode.ScaleToFit, true, 10.0F);
     }
 }