Pause menu script not working

Questions & Answers
1

I’m trying to make pause menu for my project. I took help from Brackeys’ video for the same. The only issue is when I press escape (as specified in KeyCode) key during the play mode nothing happens.
This is the script that I’m using.

using UnityEngine;

public class PauseMenu : MonoBehaviour
{
    public static bool gameIsPaused = false;
    public GameObject pauseUI;

    void update()
    {
        if(Input.GetKeyDown(KeyCode.Escape))
        {
            if(gameIsPaused == true)
            {
                resume();
            }
            else if(gameIsPaused == false)
            {
                pause();
            }
        }   
    }
    public void resume()
    {
        pauseUI.SetActive(false);
        Time.timeScale = 1f;
        gameIsPaused = false;
    }
    void pause()
    {
        pauseUI.SetActive(true);
        Time.timeScale = 0f;
        gameIsPaused = true;
    }
    public void loadMenu(string name)
    {
        Debug.Log("Loading " + name);
        Time.timeScale = 1f;
        Application.LoadLevel(name);
    }
    public void quit()
    {
        Application.Quit();
        Debug.Log("Quitting Game");
    }
}
2

As Update is a internal function from Unity, Is possible, update must be writen:

void Update()

not

void update()

Bye!