swap cameras with delay

I have spent days on trying this. several scripts here looked promising but bouncing back and forth between java and C# as well as making the slight changes I need to try to alter them for my needs is driving me crazy. Errors abound or they just don't work. All I want is that when the player walks into a trigger zone, 3 seconds pass by before the camera switches. I have the script for the switching I just can't successfully add the Ienumerator or coroutine to get a delay

using UnityEngine; using System.Collections;

public class cameraSwap : MonoBehaviour {

 public Camera Camera1;
 public Camera Camera2;



 void Start () {
     Camera1.enabled = true;
     Camera2.enabled = false;

 }
 
 void OnTriggerEnter (Collider other) {
     if(other.tag == "Player")
     {

         Camera1.enabled = false;
         Camera2.enabled = true;
     }
 }

}