DoorSetActive.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DoorSetActive : MonoBehaviour
{

    [SerializeField]
    public GameObject[] switches;

    int numOfSwitches = 0;


    private void Update()
    {
        GetNumOfSwitches();
        GetSwitchDoor();
    }
    public int GetNumOfSwitches()
    {
        int num = 0;

        for (int i = 0; i <= switches.Length; i++)
        {
            numOfSwitches = num;

            if (switches[i].GetComponent<DoorSwitch>().isPressed == false)

                num++;

             else if (switches[i].GetComponent<DoorSwitch>().isPressed == true)

                numOfSwitches--;

            //return numOfSwitches;
        }
        return numOfSwitches;

    }

    public void GetSwitchDoor()
    {
        if (numOfSwitches <= 0)
        {
           Destroy(this.gameObject);
        }
    }
}