Problems with my playerprefs. and Level Lock System

I have tried looking up specific codes on the internet but most of the answers i find are too old to use or out of my understanding. Here is some of my code that I think will work if I can figure out what's wrong with it. I am currently making a mobile 2D game so this is probably why it's confusing.

The issues I am having is that levels are all still clickable or you do not have to beat the level to unlock the next one, I placed Lock sprites to make them not interact with them. But this didn't really help lock them.

code

 using UnityEngine;
 using UnityEngine.SceneManagement;
 
 public class LevelCompleted : MonoBehaviour
 {
 
     public string nextLevel = "Level 2";
     public int levelToUnlock = 2;
 
 
 
     public void LoadNextLevel()
     {
         int currentUnlock = PlayerPrefs.GetInt("You win!");
 
         if (currentUnlock < levelToUnlock)
         {
             PlayerPrefs.SetInt("You win!", levelToUnlock);
         }
         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
     }
 }