Crouch Script/ Scaling transform from one side only

Im trying to make a crouching script but there's something wrong with my code, I've been stuck in here for so many hours and I still don't know what's wrong.

Im basically just trying to decrease the height of my player transform to crouch, and increase it to stand up.

Im using a CharacterController component so using the Physics.CapsuleCast feature isn't an option.

Here's my code:

 public float crouchSpeed;
 public float crouchWalkSpeed;
 public bool isCrouching = false;
 public bool isCrouched = false;

 void Update () {

     Crouch();
     IsCrouchingVoid();
 }

 public void Crouch()
     {
         if(Input.GetKeyDown(KeyCode.LeftControl) && isOnGroud)
         {
             isCrouched = !isCrouched;
             isCrouching = true;
         }
     }
 
     public void IsCrouchingVoid()
     {
         if(!isCrouched)
         {
             if (isCrouching)
             {
                     Vector3 temp = transform.localScale;
                     temp.y -= crouchSpeed / 60;
                     temp.x = 1f;
                     temp.z = 1f;
                     transform.localScale = temp;
 
                 if (temp.y <= 0.5f)
                 {
                     temp.y = 0.5f;
                     isCrouching = false;
                 }
             }
         }
 
         else if(isCrouched)
         {
             if (isCrouching)
             {
                     Vector3 temp = transform.localScale;
                     temp.y += crouchSpeed / 60;
                     temp.x = 1f;
                     temp.z = 1f;
                     transform.localScale = temp;
 
                 if (temp.y >= 1f)
                 {
                     temp.y = 1f;
                     isCrouching = false;
                 }
             }
         }
     }

Thank you.