Bug Boolean not changing value

Objective - To change the position of door(PortalGuard) if user acquires 4 keys and touches the door.
Problem - bool gkey1, gkey2, gkey3, gkey4 are not updating to true.
I changed then to be true at once and then the door opened. But I want to initialise them at false and chage to true one by one once user touches them.
Code attached below.

Code (CSharp):

1.  
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class KeyAcquired : MonoBehaviour
7. {
8.     public GameObject key1;
9.     public GameObject key2;
10.     public GameObject key3;
11.     public GameObject key4;
12.     public GameObject portalGuard;
13.     public GameObject portalGuardText;
14.     public ParticleSystem accquiredEffect;
15.  
16.     private bool gkey1;
17.     private bool gkey2;
18.     private bool gkey3;
19.     private bool gkey4;
20.  
21.     // Start is called before the first frame update
22.     void Start()
23.     {
24.         Debug.Log("Keys Acquired Script is running");
25.         gkey1 = false;
26.         gkey2 = false;
27.         gkey3 = false;
28.         gkey4 = false;
29.     }
30.  
31.     // Update is called once per frame
32.  
33.     public void OnTriggerEnter(Collider other)
34.     {
35.         if (other.gameObject.tag == "Key1")
36.         {
37.             gkey1 = true;
38.             Instantiate(accquiredEffect, key1.transform.position, transform.rotation);
39.             key1.transform.position = new Vector3(5000, 5000, 5000);
40.         }
41.         if (other.gameObject.tag == "Key2")
42.         {
43.             gkey2 = true;
44.             Instantiate(accquiredEffect, key2.transform.position, transform.rotation);
45.             key2.transform.position = new Vector3(5000, 5000, 5000);
46.         }
47.         if (other.gameObject.tag == "Key3")
48.         {
49.             gkey3 = true;
50.             Instantiate(accquiredEffect, key3.transform.position, transform.rotation);
51.             key3.transform.position = new Vector3(5000, 5000, 5000);
52.         }
53.         if (other.gameObject.tag == "Key4")
54.         {
55.             gkey4 = true;
56.             Instantiate(accquiredEffect, key4.transform.position, transform.rotation);
57.             key4.transform.position = new Vector3(5000, 5000, 5000);
58.         }
59.         if(other.gameObject.tag == "PortalGuard")
60.         {
61.             if(gkey1 && gkey2 && gkey3 && gkey4)
62.             {
63.                 Instantiate(accquiredEffect, portalGuard.transform.position, transform.rotation);
64.                 portalGuard.transform.position = new Vector3(5000, 5000, 5000);
65.                 portalGuardText.transform.position = new Vector3(5000, 5000, 5000);
66.             }
67.         }
68.     }
69. }
70.  

 

I started learning c# and unity few weeks ago, so noob here. Sorry for wrong tags sir.

OnTriggerEnter is being called and colliders are also being hit as Instantiate and transform.position are working. Only the gkey value is not changing to true.

And if I initialise gkey values to true and remove gkey change codes, last if is working. So I have pin pointed the problem to gkey value not changing. Please help me out sir.