Zoom in when player is accelerating/ if not zoom out

This is the code i have written - the player movement is fine but I can't get the orthographic size to lerp to Maximum Orthographic size/Minimum Orthographic size.

 using UnityEngine;
 using System.Collections;
 
 public class playerMovement : MonoBehaviour {
     //orthographic size for zoom Effect
     public float maxOrthographicSize = 40f;
     public float minOrthographicSize = 25f;
     public float Smoothing = 1f;
 
     public float maxSpeed = 200f; // Maximum speed - will be used to LIMIT PLAYER SPEED.
     public float aceleration = 5f; // Player acceleration Speed.
     public float rotateSpeed = 180f; // Player Rotation Speed
     bool onMove; // Use this to check for Player Input to Move Forward
 
     // Do GRAPHICS and INPUTS updates
     void Update () {
         //// ROTATING THE PLAYER SHIP
 
         // Grab our rotation quaternion
         Quaternion rotate = transform.rotation;
 
         // Grab the Z euler angle
         float z = rotate.eulerAngles.z;
 
         // Change the Z angle based on input
         z -= Input.GetAxis("Horizontal") * rotateSpeed * Time.deltaTime;
 
         // Recreate the quaternion
         rotate = Quaternion.Euler(0, 0, z);
 
         // Feed the quaternion into our rotation
         transform.rotation = rotate;
         
         // When The player is Holding Down the Input set the Boolean to "True".
         if (Input.GetButtonDown("Move")){
             onMove = true;
             AccelerationZoomOut();
         }
 
 
         // if the button is not being Held down the Boolean is set to "False".
         if (Input.GetButtonUp("Move")) {
             onMove = false;
             NoAccelerationZoomIn();
             
         }
     }
 
     // Do the Physics Engine updates here!
     void FixedUpdate() {
         //When the the Move Button is down then Player MOVES
         // if the Bool is False then the Rigidbody will fall
         if (onMove == true)
         {
             // Pushed Playership RIGIDBODY
             rigidbody2D.AddForce(transform.up * aceleration* Time.deltaTime);
 
             // limit the Player speed from turning into a torpedo
             rigidbody2D.velocity = Vector3.ClampMagnitude(rigidbody2D.velocity, maxSpeed);
            
 
         }
         
     }
 
     void AccelerationZoomOut()
     {
         //When Player is Accelerating the camera zooms out from the player
         Camera.main.orthographicSize = Mathf.Lerp(maxOrthographicSize, minOrthographicSize, Time.deltaTime * Smoothing);
     }
 
     void NoAccelerationZoomIn()
     {
         //When Player is not accelerating the camera zooms in to the player
         Camera.main.orthographicSize = Mathf.Lerp(minOrthographicSize, maxOrthographicSize, Time.deltaTime * Smoothing);
     }
 }