Unity Pause Menu buttons doesn't work :/

Hi i have First Person 3D game where i clicking "left mouse button" to turn on flashlight when i press "ESC" to Pause a game : Canvas will show with both buttons "Resume and Quit" but they didn't work when i press anywhere on the menu mouse will disappear and nothing happens i made a debug.log ("Resume") when i click on Resume that debug will show up or when i pressing ESC i am a beginner in coding so i hope you help me with this i am stuck... Thank you

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
 
 
 public class PauseMenu : MonoBehaviour
 {
     public static bool GameIsPaused = false;
 
     public GameObject pauseMenuUI;
     public GameObject flashlight;
 
 
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.Escape))
         {
             if (GameIsPaused)
             {
                 Resume();
             }
             else
             {
                 Pause();
             }
 
         }
     }
 
     public void Resume()
     {
         Debug.Log("Resume");
         pauseMenuUI.SetActive(false);
         Time.timeScale = 1f;
         GameIsPaused = false;
         Cursor.visible = false;
         Cursor.lockState = CursorLockMode.Locked;
         flashlight.SetActive(true);
     }
 
     public void Pause()
     {
         pauseMenuUI.SetActive(true);
         Time.timeScale = 0f;
         GameIsPaused = true;
         Cursor.visible = true;
         Cursor.lockState = CursorLockMode.None;
         flashlight.SetActive(false);
 
     }
 
 
     public void QuitGame()
     {
         Debug.Log("Quitting Game...");
         Application.Quit();
     }
 
 }