How to Get a Login Function to Work Locally?

So I am making this program for my Dad to use at work so he can take Inventory on Items and a few other things. What I want to do is create a Login system that doesn't use network functionality it just checks if the fields are correct and loads the program. Currently what I have seems to work for getting the correct Login but I cannot get it to detect an incorrect Login. My current Script looks like this. var userToEdit : String; var passwordToEdit : String; var customSkin : GUISkin; var correctLogin : boolean = false;

 function Start () {
 
 }
 
 function Update () 
 {
     if(userToEdit == "User" && passwordToEdit == "password")
         {
             correctLogin = true;
         }
     else
         {
             correctLogin = false;
         }
 }
 
 function OnGUI ()
 {
 GUI.skin = customSkin;
 
     userToEdit = GUI.TextField(Rect (Screen.width/ 2 - 50,Screen.height/2,200,20), userToEdit, 25);
 
     passwordToEdit = GUI.PasswordField(Rect (Screen.width/2 - 50,Screen.height/2 + 25,200,20), passwordToEdit, "*"[0], 25);
     
     if(GUILayout.Button("Login", "button") && correctLogin == true)
     {
         Debug.Log("This Button Works!");
     }
     else
     {
         Debug.Log("Login Failure");
     }
     
 }

Originally there wasn't a boolean but I added it to see if it would work better to no avail. What I think is the issue is that the Button I create isn't a permanent object and I cannot reference it outside of that one line of code. How can I make it so if the User and Password are incorrect and I click the Login button it will display "Incorrect Login" in the Debug Log? Any help will be very much appreciated :)