How to get a camera state to wait with coroutine?

Fairly new to Unity I wanted to know how to keep a camera in a state while the player is shooting. There are two cameras in the scene and for now, it does switch, but for 0.01 sec before switching back to the main camera. Thank you!

Using: https://docs.unity3d.com/Manual/MultipleCameras.html and https://docs.unity3d.com/ScriptReference/MonoBehaviour.StartCoroutine.html

 void CheckStates(){
         switch(state)
         {
             case State.gunNotEquipped:
                 DoGunNotEqipped();
                 break;
 
             case State.gunEquipped:
                 if(Input.GetKeyDown(KeyCode.E)){
                     StartCoroutine(DoGunEqipped());
                 }
                 break;
 
             default:
                 break;
 
         }
 
     }

 IEnumerator DoGunEqipped(){
         
         defaultCamera.enabled = false;
         firstPersonCamera.enabled = true;
         gunClicked = true;
 
         while(firstPersonCamera.enabled == true){
 
             if(Input.GetMouseButtonDown(0) || Input.GetKeyDown(KeyCode.G)){
                 ShootBullet();
                 Debug.Log("Shooting");
             }
 
             Debug.Log("Shoot with right click");
             yield return new WaitForSeconds(45f);
         }
         
     }