IEnumerator and waitforseconds problems

Can someone tell me what I did wrong. It just doesn't execute the couroutine with WaitForSeconds, it jsut immediatly proceeds to the next thing without waiting

Code (CSharp):

1.     void Start()
2.     {
3.         TargetSelection();
4.     }
5.  
6.     IEnumerator DoingJob()
7.     {
8.        yield return new WaitForSeconds(20f);[
9.     }
10.     private void Awake()
11.     {
12.         //positon the person at the start point
13.         transform.position = new Vector3(56f, 0.1f, 24f);
14.     }
15.     void TargetSelection()
16.     {
17.         StartCoroutine(DoingJob());
18.         do
19.         {
20.             number = Random.Range(0, zielpositionen.Count);
21.         }
22.         while (number == lasttarget);
23.         lasttarget = number;
24.         Debug.Log("selected target: " +number);
25.  
26.         target = zielpositionen[number].transform;
27.         transform.LookAt(target);
28.  
29.         journeyLength = Vector3.Distance(target.position, transform.position);
30.         startTime = Time.time;
31.         Tasks++;
32.     }
33.  
34.  
35.  
36.    
37.  
38.     // Update is called once per frame
39.     void Update()
40.     {
41.  
42.         if (Vector3.Distance(transform.position, target.position) < 1.0f)
43.         {
44.             Debug.Log("arrived");
45.             TargetSelection();
46.             return;
47.         }

 

If it helps, here's the entire class:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class TestMove : MonoBehaviour
6. {
7.  
8.     private Transform target;
9.     public float speed;
10.     public int Tasks = 0;
11.     public float waitseconds = 100f;
12.     public int tasksinaday = 5;
13.     public List<GameObject> zielpositionen = new List<GameObject>();
14.     private int lasttarget;
15.     private float journeyLength;
16.     private float startTime;
17.     public int number;
18.     // Start is called before the first frame update
19.     void Start()
20.     {
21.         TargetSelection();
22.     }
23.  
24.     IEnumerator DoingJob()
25.     {
26.         yield return new WaitForSeconds(20f);
27.     }
28.     private void Awake()
29.     {
30.         //positon the person at the start point
31.         transform.position = new Vector3(56f, 0.1f, 24f);
32.     }
33.     void TargetSelection()
34.     {
35.         StartCoroutine(DoingJob());
36.         do
37.         {
38.             number = Random.Range(0, zielpositionen.Count);
39.         }
40.         while (number == lasttarget);
41.         lasttarget = number;
42.         Debug.Log("selected target: " +number);
43.  
44.         target = zielpositionen[number].transform;
45.         transform.LookAt(target);
46.  
47.         journeyLength = Vector3.Distance(target.position, transform.position);
48.         startTime = Time.time;
49.         Tasks++;
50.     }
51.  
52.  
53.  
54.    
55.  
56.     // Update is called once per frame
57.     void Update()
58.     {
59.  
60.         if (Vector3.Distance(transform.position, target.position) < 1.0f)
61.         {
62.             Debug.Log("arrived");
63.             TargetSelection();
64.             return;
65.         }
66.  
67.         if (Tasks == tasksinaday)
68.         {
69.  
70.         }
71.  
72.  
73.  
74.        /* for(Vector3.Distance(transform.position, target.position) > 0.5F)
75.         {
76.            
77.         }*/
78.  
79.         // Distance moved equals elapsed time times speed..
80.         float distCovered = (Time.time - startTime) * speed;
81.  
82.         // Fraction of journey completed equals current distance divided by total distance.
83.         float fractionOfJourney = distCovered / journeyLength;
84.  
85.         // Set our position as a fraction of the distance between the markers.
86.         transform.position = Vector3.Lerp(transform.position, target.position, fractionOfJourney);
87.  
88.  
89.  
90.     }
91. }
92.