Scriptum/Assets/Scripts/DoorBehaviour.cs

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

public class DoorBehaviour : MonoBehaviour
{
    public static DoorBehaviour Instance;
    public string SceneName = "SampleScene";

    public GameObject SaveController;
    private void Awake()
    {
        if(Instance == null)
        {
            Instance = this;
        }else if (Instance != this)
        {
            Destroy(gameObject);
        }
    }

    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }

    public void ScenetToMoveTo()
    {
        // 1. Save all befor change scene
        SaveController.GetComponent<SaveController>().SaveItems();
        SaveController.GetComponent<SaveController>().SaveQuests();
        SaveController.GetComponent<SaveController>().SaveInventory();
        // 2. Change scene
        SceneManager.LoadScene(this.SceneName);
    }
}