Scriptum/Assets/OpenPanelOnCollision.cs

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

public class OpenPanelOnCollision : MonoBehaviour
{

    public GameObject Panel;
    public GameObject OtherPanel;
    public GameObject SecondPanel;
    public GameObject PanelAbove;

    public GameObject obj;

    private bool inRange = false;

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.tag == "Player")
        {
            inRange = true;
            if(SecondPanel.active == false)
            {
                Panel.SetActive(true);
            }
            else
            {
                PanelAbove.SetActive(true);
            }
        }    
    }

    private void OnTriggerStay2D(Collider2D collision)
    {
        if (collision.tag == "Player")
        {
            inRange = true;
            if(OtherPanel.active == true)
            {
                if (SecondPanel.active == false)
                {
                    Panel.SetActive(false);
                }
                else
                {
                    SecondPanel.SetActive(false);
                    PanelAbove.SetActive(false);
                }
            }
            else if (SecondPanel.active == false)
            {
                Panel.SetActive(true);
            }
            else
            {
                PanelAbove.SetActive(true);
            }
        }
    }


    IEnumerator Timer1()
    {
        yield return new WaitForSeconds(0.3f);
        if(inRange == false)
        {
            Panel.SetActive(false);
        }
    }

    IEnumerator Timer2()
    {
        yield return new WaitForSeconds(0.3f);
        if (inRange == false)
        {
            PanelAbove.SetActive(false);
        }
    }

    void Update()
    {

        if(obj.active == false)
        {
            if (Panel.active == true)
            {
                Panel.SetActive(false);
            }
            else if (PanelAbove.active == true)
            {
                PanelAbove.SetActive(false);
            }
        }

        if(OtherPanel.active == true)
        {
            StartCoroutine(Timer1());
        }
        if(SecondPanel.active == false)
        {
            if(PanelAbove.active == true)
            {
                StartCoroutine(Timer2());
                PanelAbove.SetActive(false);
                Panel.SetActive(true);
            }
        }
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        inRange = false;
        if(Panel.active == true)
        {
            StartCoroutine(Timer1());
        }
        else if(PanelAbove.active == true)
        {
            StartCoroutine(Timer2());
        }
    }
}