Components with same script destroyed when one of then is destroyed

sorry for english,..... i am working on a horror game i add multiple doors an keys the keys contain same script for multiple doors when i click button on a key all of them is destryoyed...

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

 public class Key : MonoBehaviour {
 
     public Door myDoor;
 
     public void  UnlockDoor()
     {
         myDoor.isLocked = false;
         Destroy (gameObject);
     }
 }
 

Door script.. using System.Collections.Generic; using UnityEngine;

public class Door : MonoBehaviour {

 public bool open = false;
 private bool hasOpenedCompletely;
 public float doorOpenAngle = 90f;
 public float doorClosedAngle = 0f;
 public float smooth = 2f;
 public bool isLocked = false;

 public void changeDoorState()
 {
     if (isLocked != true) {
         open = !open;
     }

 }
 // Update is called once per frame
 void Update () {
     if (open) {
         Quaternion targetRotationOpen = Quaternion.Euler (270, doorOpenAngle, 0);
         transform.localRotation = Quaternion.Slerp (transform.localRotation, targetRotationOpen, smooth * Time.deltaTime);
     } else {
         Quaternion targetRotationClosed = Quaternion.Euler (270, doorClosedAngle, 0);
         transform.localRotation = Quaternion.Slerp (transform.localRotation, targetRotationClosed, smooth * Time.deltaTime);
     }


 }

}

interact Script..

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class Interact : MonoBehaviour {
 
     public string interactButton;
     public float interactDistance = 3f;
     public LayerMask interactLayer;
     public Image interaction;
     public bool isInteracting;
     public Button Ibutton;
     public Button Dbutton;
 
     void Start () {
         if (interaction != null) {
             interaction.enabled = false;
             Ibutton.gameObject.SetActive (false);
             Dbutton.gameObject.SetActive (false);
 
         }
     }
     
     // Update is called once per frame2
     void Update () {
         Ray ray = new Ray (transform.position, transform.forward);
         RaycastHit hit;
         if (Physics.Raycast (ray, out hit, interactDistance, interactLayer)) {
             if (!isInteracting == false) {
                 if (interaction != null) {
                     interaction.enabled = true;
                 }
                 if (Input.GetButtonDown (interactButton)) {
                     if (hit.collider.CompareTag ("Key")) {
                         hit.collider.GetComponent<Key> ().UnlockDoor ();
                         Ibutton.gameObject.SetActive (true);
                     
                     } else if (hit.collider.CompareTag ("Door")) {
                         hit.collider.GetComponent<Door> ().changeDoorState ();
                         Dbutton.gameObject.SetActive (true);
                     }
                 } 
             }
         }
          else {
             interaction.enabled = false;
 
         }
 
     }
 }