How do I make a crouch script unity 3d

Questions & Answers
1

I just started learning to code in Unity and I wanted to create a crouch script by making the player’s scale smaller, but it did not work; can you please help me understand what I’ve done wrong and fix my code and please make it as simple as possible?

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Movement : MonoBehaviour
{
    private bool JumpKeyWasPressed;
    private GameObject plr;
    private Vector3 scl;
    // Start is called before the first frame update
    void Start()
    {
        scl = gameObject.GetComponent("Player").transform.localScale;
        plr = GameObject.Find("Player");
    }

    // Update is called once per frame
    void Update()
    {
        // Jump
        if (Input.GetKeyDown(KeyCode.Space))
        {
            JumpKeyWasPressed = true;
        }
        // Right and Left movement
        float horizontalInput = Input.GetAxis("Horizontal");
        GetComponent<Rigidbody>().velocity = new Vector3(horizontalInput * 2.5f, GetComponent<Rigidbody>().velocity.y, 0);
        // Crouch
        if (Input.GetKeyDown(KeyCode.C))
        {
            gameObject.GetComponent("Player").transform.localScale += new Vector3(0.5f, 0.25f, 0.5f);
        }
        else
        {
            gameObject.GetComponent("Player").transform.localScale += new Vector3(0.5f, 0.5f, 0.5f);
        }
    }

    private void FixedUpdate()
    {
        // Jump
        if (JumpKeyWasPressed == true)
        {
            GetComponent<Rigidbody>().AddForce(Vector3.up * 5, ForceMode.VelocityChange);
            JumpKeyWasPressed = false;
        }
    }
}
2

try this code

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class Movement : MonoBehaviour
 {
     private bool JumpKeyWasPressed;

     // Update is called once per frame
     void Update()
     {
         // Jump
         if (Input.GetKeyDown(KeyCode.Space))
         {
             JumpKeyWasPressed = true;
         }
         // Right and Left movement
         float horizontalInput = Input.GetAxis("Horizontal");
         GetComponent<Rigidbody>().velocity = new Vector3(horizontalInput * 2.5f, GetComponent<Rigidbody>().velocity.y, 0);
         // Crouch
         if (Input.GetKeyDown(KeyCode.C))
         {
             transform.localScale = new Vector3(0.5f, 0.25f, 0.5f);
         }
         else
         {
             transform.localScale = new Vector3(0.5f, 0.5f, 0.5f);
         }
     }
 
     private void FixedUpdate()
     {
         // Jump
         if (JumpKeyWasPressed == true)
         {
             GetComponent<Rigidbody>().AddForce(Vector3.up * 5, ForceMode.VelocityChange);
             JumpKeyWasPressed = false;
         }
     }
 }