brownDoor.cs

using UnityEngine;

public class brownDoor : MonoBehaviour
{
    private stageControl stageControlScript; // access the stage control script
    [SerializeField] private Transform openPosition; // Position where the door moves down to
    [SerializeField] private Transform closedPosition; // Position where the door moves up to
    [SerializeField] private float speed = 1.0f; // Speed of the door's movement

    private bool isOpening = false; 
    private bool isClosing = false;
    private bool hasOpened = false;


    private void Awake()
    {
        stageControlScript = GetComponent<stageControl>();
    }

    private void openDoor()
    {
        // open door
        hasOpened = true;
        isOpening = true;
        isClosing = false;
    }

    public void closeDoor()
    {
        // close door
        isOpening = false;
        isClosing = true;
    }


    // Update is called once per frame
    void Update()
    {
        if (stageControlScript.stageComplete && !hasOpened)
        {
            openDoor();
        }

        if (isOpening)
        {
            transform.position = Vector3.MoveTowards(transform.position, openPosition.position, speed * Time.deltaTime);
            // move down

            if (transform.position == openPosition.position)
            {
                isOpening = false;
                // the door has opened
            }
        }
        if (isClosing)
        {
            // move up
            transform.position = Vector3.MoveTowards(transform.position, closedPosition.position, speed * Time.deltaTime);

           
            if (transform.position == closedPosition.position)
            {
                isClosing = false;
            } // door has closed

        }
    }

}