Spawning gameobjects every 5 seconds in my area

Hello.
I dont know how to solve my problem.

I need my game objects to multiply every 5 seconds in random order.

My spawn area code:

Code (CSharp):

1. public class Spawner : MonoBehaviour {
2.    
3.     public GameObject hazard4;
4.     public GameObject hazard3;
5.     public GameObject hazard2;
6.     public GameObject hazard;
7.     public Vector3 spawner;
8.     public Vector3 spawner2;
9.     public Vector3 spawner3;
10.     public Vector3 spawner4;
11.  
12.     public int CakajSpawn;
13.     public int StartSpawn;
14.     public bool stop;
15.  
16.     int pocet;
17.  
18.     private void Start()
19.     {
20.         StartCoroutine(pockaj());
21.         SpawnHore();
22.         SpawnDole();
23.         SpawnVlavo();
24.         SpawnVpravo();
25.  
26.     }
27.  
28.     public void Update()
29.     {
30.      
31.     }
32.  
33.     void SpawnHore()
34.     {
35.         Vector3 SpawnPozicia = new Vector3(Random.Range(-spawner.x,spawner.x),spawner.y,spawner.z);
36.         Quaternion SpawnRotator = new Quaternion();
37.         Instantiate(hazard, SpawnPozicia, SpawnRotator);
38.  
39.     }
40.  
41.     void SpawnDole()
42.     {
43.         Vector3 SpawnPozicia = new Vector3(Random.Range(-spawner2.x, spawner2.x), -spawner2.y, spawner2.z);
44.         Quaternion SpawnRotator = new Quaternion();
45.         Instantiate(hazard2, SpawnPozicia, SpawnRotator);
46.  
47.     }
48.  
49.     void SpawnVlavo()
50.     {
51.         Vector3 SpawnPozicia = new Vector3(-spawner3.x,Random.Range(-spawner3.y,spawner3.y),spawner3.z);
52.         Quaternion SpawnRotator = new Quaternion();
53.         Instantiate(hazard3, SpawnPozicia, SpawnRotator);
54.        
55.     }
56.  
57.  
58.  
59.     void SpawnVpravo()
60.     {
61.         Vector3 SpawnPozicia = new Vector3(spawner4.x, Random.Range(-spawner4.y, spawner4.y), spawner4.z);
62.         Quaternion SpawnRotator = new Quaternion();
63.         Instantiate(hazard4, SpawnPozicia, SpawnRotator);
64.     }
65.  
66.     IEnumerator pockaj()
67.     {
68.  
69.         yield return new WaitForSeconds(StartSpawn);
70.         while (!stop)
71.         {
72.             pocet = Random.Range(0, 2);
73.  
74.             yield return new WaitForSeconds(CakajSpawn);
75.         }
76.     }
77. }

Thank you for every answer.