Input.GetAxis to act like button

Hi! I've been trying to solve this all day but I just cant. My game is a 2.5 running game where the character automatically moves in +x axis. I want to have 3 separate lines to run along. The idea is that the character would change its running line when the right analog stick is tilted up or down and stick to that line until right analog stick is tilted again, up or down of course.

Here is my code so far:

 using UnityEngine;
 using System.Collections;
 
 public class scr_PlayerTest : MonoBehaviour
 {
     public float speed = 6.0F;
     public float jumpSpeed = 8.0F;
     public float gravity = 20.0F;
     public float dashDistance = 0;
     private int jumpCount = 0;
     private int laneNumber = 0;
     private Vector2 abilityDash = Vector2.right;
     private Vector2 moveDirection = Vector2.zero;
 
     void Awake()
     {
         laneNumber = 0;
     }
 
     void Update()
     {
         CharacterController player = GetComponent<CharacterController>();
 
         if (player.isGrounded)
         {
             // resets jump counter
             jumpCount = 0;
             // if player is on the ground, we normally don't want to move him vertically
             moveDirection.y = 0;
 
             // but if the jump button is pressed, then we do want him moving vertically
             if (Input.GetButton("Jump"))
             {
                 // first jump counter
                 jumpCount++;
                 moveDirection.y = jumpSpeed;
             }
         }
         else
         {
             // if player is not on the ground, then apply gravity to him
             moveDirection.y -= gravity * Time.deltaTime;
             // allows small jumps
             if (Input.GetButtonUp("Jump") && (jumpCount > 0))
             {
                 // second jump counter
                 jumpCount++;
                 moveDirection.y = gravity * Time.deltaTime;
 
             }
         }
 // I'll deal with this later
         if (Input.GetButton("Dash"))
         {
             player.Move(abilityDash * 1);
             print("we are dashing");
         }
         { //HERE IT ALL GOES TO HELL!
             float lanePos0 = Input.GetAxis("Change Lane") * transform.localPosition.z -7.5f;
             float lanePos1 = Input.GetAxis("Change Lane") * transform.localPosition.z -2.5f;
             float lanePos2 = Input.GetAxis("Change Lane") * transform.localPosition.z +2.5f;
 
             if (laneNumber == 0)
             {
                 transform.localPosition = new Vector3(0f, 0f, lanePos2);
                 laneNumber++;
             }
             if (laneNumber == 1)
             {
                 transform.localPosition = new Vector3(0f, 0f, lanePos2);
                 laneNumber++;
             }
             if (laneNumber == 2)
             {
                 transform.localPosition = new Vector3(0f, 0f, lanePos1);
                 laneNumber--;
             }
         }
         // constantly move horizontally
         moveDirection.x = speed;
 
         // finally, we actually apply the movement to the player
         player.Move(moveDirection * Time.deltaTime);
     }
 }