why doesn't timescale work?

I've made a game with a pause menu, so if the you press "p" there is a pause menu. but the problem is that the game itself not pauses. I don't know how to fix it. Here is my script:

 using UnityEngine;
 using System.Collections;
 
 public class PauseMenu : MonoBehaviour {
 
     public GameObject PauseUI;
     private bool paused = false;
 
     void Start(){
         PauseUI.SetActive(false);
     }
 
     void Update(){
         if (Input.GetKeyDown(KeyCode.P)){
             paused = !paused;
         }
         if(paused){
             PauseUI.SetActive(true);
             Time.timeScale = 0;
         }
         if(!paused){
             PauseUI.SetActive(false);
             Time.timeScale = 1;
         }
     }
 }