keycode not working

My speed is not changing at all but when i put print("test") in the if statement it will print test before i had: Input.getbutton(fire3) since it was set as the left shift after that i changed to this code:
This is the full code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class CharMove : MonoBehaviour
6. {
7.     //link the character controller
8.     public CharacterController controller;
9.     //set movment speed
10.     public float speed = 10f;
11.  
12.     Vector3 velocity;
13.     //set gravity for the player
14.     public float gravity = -10f;
15.  
16.     //link groundcheck
17.     public Transform Groundcheck;
18.     public float GroundDistance = 0.4f;
19.     public LayerMask Groundmask;
20.     public float jump = 3f;
21.  
22.     bool isGrounded;
23.  
24.     void Update()
25.     {
26.  
27.         isGrounded = Physics.CheckSphere(Groundcheck.position, GroundDistance, Groundmask);
28.  
29.         if (isGrounded && velocity.y < 0)
30.         {
31.             velocity.y = -2;
32.         }
33.         //W +1y S-1y    A-1x D+1x!!!caps H and V!!!
34.         float x = Input.GetAxis("Horizontal");
35.         float z = Input.GetAxis("Vertical");
36.  
37.         Vector3 move = transform.right * x + transform.forward * z;
38.  
39.         controller.Move(move * speed * Time.deltaTime);
40.  
41.         velocity.y += gravity * Time.deltaTime;
42.  
43.         controller.Move(velocity * Time.deltaTime);
44.  
45.         if (Input.GetButton("Jump") && isGrounded)
46.         {
47.             velocity.y = Mathf.Sqrt(jump * -2f * gravity);
48.         }
49.  
50.         if (Input.GetKeyDown(KeyCode.LeftShift) && isGrounded){
51.             speed = 20;
52.         }
53.         else
54.         {
55.             speed = 10;
56.         }
57.     }
58. }
59.  

 

GetKeyDown

is only true for the first frame that the key was pressed.
If you want the if-statement to run while the key is being held, use

GetKey

instead.

 

Ok il try it out thanks!