how to make a door close for ever after a player pass through it

hi there. im using two scripts. first one is at the door:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.SceneManagement;
 
 public class doorscript : MonoBehaviour
 {
     public bool open = false;
     public float DoorOpenAngle = 90f;
     public float DoorCloseAngle = 0f;
     public float smooth = 2f;
     
     
     // Use this for initialization
     void Start()
     {
 
     }
 
 
     public void OnTriggerEnter(Collider other)
     {
         open = false;
       
     }
     public void ChangeDoorState()
     {
         open = !open;
 
 
     }
     // Update is called once per frame
     void Update()
     {
 
         if (open)
         {
             Quaternion targetRotation = Quaternion.Euler(0, DoorOpenAngle, 0);
             transform.localRotation = Quaternion.Slerp(transform.localRotation, targetRotation, smooth * Time.deltaTime);
 
         }
         else
         {
             Quaternion targetRotation2 = Quaternion.Euler(0, DoorCloseAngle, 0);
             transform.localRotation = Quaternion.Slerp(transform.localRotation, targetRotation2, smooth * Time.deltaTime);
         }
     }
 }
 

the second is for ray casting at the character camera

 using UnityEngine;
 using System.Collections;
 
 public class interactscriptt : MonoBehaviour
 {
     public float InteractDistance = 5f;
     // Use this for initialization
     void Start()
     {
 
     }
 
     // Update is called once per frame
     void Update()
     {
         if (Input.GetKeyDown(KeyCode.Mouse0))
         {
             Ray ray = new Ray(transform.position, transform.forward);
             RaycastHit hit;
             if (Physics.Raycast(ray, out hit, InteractDistance))
 
 
                 if (hit.collider.CompareTag("Door"))
                 {
                     hit.collider.transform.GetComponent<doorscript>().ChangeDoorState();
 
                 }
 
         }
     }
 }
 

i want to do it at triggerenter if possible. i tried to do it but i couldnt.

thank you so much in advance