Field Of View changing on click, not automatically

I'm trying to increase the Field of View on a player object when their "boost" is active and then decrease back to the default after a second. I'm using some code from a tutorial to adjust the field of view back and forth on click and it works exactly as expected, but I want it to return to normal FOV after a second or two. I'm new to C# and Unity so I can't seem to find the fault in the logic that is preventing the script from working.

     private float boostRate = 1.5f;
     private float nextBoost;
     public int zoom = 75;
     public int normal = 60;
     public float smooth = 15;
 
     public bool isZoomed = false;
 
     void Update() {
         //What works
         if(Input.GetKeyDown(KeyCode.LeftShift)) {
             isZoomed = !isZoomed;
         }
         if (isZoomed) {
             ZoomOut(); 
         }
         else {
             ZoomBack(); 
         }
         //What I want to work
         if(Input.GetKeyDown(KeyCode.LeftShift) && Time.time > nextBoost) {
             nextBoost = Time.time + boostRate;
             ZoomOut();
             Invoke("ZoomBack", 2.0f);
             
         }
     }
 
     void ZoomOut() {
         GetComponent<Camera>().fieldOfView = Mathf.Lerp(GetComponent<Camera>().fieldOfView, zoom, Time.deltaTime * smooth);
     }
     void ZoomBack() {
         GetComponent<Camera>().fieldOfView = Mathf.Lerp(GetComponent<Camera>().fieldOfView, normal, Time.deltaTime * smooth);
     }