A Porta

using System.Collections;
using UnityEngine;

public class CodeLock : MonoBehaviour
{
    [SerializeField] private Renderer[] plates;
    [SerializeField] private GameObject door;
    [SerializeField] private Transform doorway;
    [SerializeField] private float openTime = 4f;
    private int next = 1;

    public void Press(int number)
    {
        if (number == next)
        {
            Debug.Log("Plate " + number);
            next++;
            if (next > 3)
            {
                Debug.Log("Unlocked");
                next = 1;
            }
        }
        else
        {
            Debug.Log("Wrong plate");
            next = 1;
            StartCoroutine(Flash());
        }
    }

    IEnumerator Flash()
    {
        foreach (Renderer plate in plates)
        {
            plate.material.color = Color.red;
        }
        yield return new WaitForSeconds(1f);
        foreach (Renderer plate in plates)
        {
            plate.material.color = Color.gray;
        }
    }

}