Animator Boolean not Changing by script C#

Hello! I have a problem when trying to change a state within my character.

using System.Collections; using UnityEngine;

public class Player : MonoBehaviour {

 public Animator anim;
 public Rigidbody rbody;

 private bool isOnGround = true;

 private bool jump = false;
 private bool doubleJump = false;
 //Stores the slide time
 private bool slide = false;
     public float slideTimer = 0f
 //Sets the maximum amount of time to slide;
 public float maxSlideTime = 0.01f;
 private bool rest = false;

 private float inputH;
 private float inputV;

 
 // Use this for initialization
 void Start () {
     anim = GetComponent<Animator>();
     rbody = GetComponent<Rigidbody>();
     
 }

 // Update is called once per frame
 void Update () {
         PlayerInput();
 }




 void PlayerInput(){
     if(Input.GetKeyDown("1")){
         print ("1 is Pressed");
         anim.Play("WAIT03", -1, 0f);
     }
     if(Input.GetMouseButtonDown(1) && !slide){
         print ("isSliding anim bool set true");
         //anim.Play("SLIDE00", -1, 0f);
         anim.SetBool("isSliding", true);
         rbody.useGravity = true;
         slideTimer = 0f;
         slide = true;
         gameObject.GetComponent<BoxCollider>().enabled = false;
     }
     /*if(slide){
         //slideTimer is given a tick rate in seconds.
         slideTimer += Time.deltaTime;
         //If slide timer is over max slide time then the slide with exit state
         if(slideTimer > maxSlideTime){
             anim.SetBool("isSliding", false);
             slide = false;
             gameObject.GetComponent<BoxCollider>().enabled = true;
         }
     }*/ 
      //Physics in Fixed Update
 void FixedUpdate()
 {
     if(jump == true){
         jump = false;
         rbody.velocity = new Vector2(0, 0);
         rbody.AddForce(new Vector2(0, 80f), ForceMode.Impulse);
     }

     if(slide == true){
         slide = false;
         rbody.velocity = new Vector2(0, 0);
         rbody.AddForce(new Vector2(80f, 0f), ForceMode.Acceleration);
     }

     if(rest == true){
         transform.position = new Vector3(-50f, 0, 0);
     }
 }

}

I've isolated the problem to the code if you look in the area where I've disabled the code in second if statement in PlayerInput(){}. In my animator when I left click it sets the anim.SetBool("isSliding", true); to true. However I want to make it set to false when the "slideTimer" exceeds the "maxSlideTime". I think maybe I didn't set the "slideTimer" to tick every second.

When I enable the code the value does change, however it doesn't tick, it merely changes once at a value ranging from around 0.015 to 0.022. How do I get the slideTimer to tick every second correctly?

Much thanks in advance.