What is wrong here?

I am trying to make a script to move a ball(the main character) and he moves to right and left without problems or errors, but dont jump. Here is the code:

 using UnityEngine;
 using System.Collections;
 
     public class MovementScript: MonoBehaviour {
         //Variables
     
         public GameObject player;
         public Rigidbody2D rb2d;
     
         public float velocity= 1;
         public float jumpForce= 3;
     
     
         // Use this for initialization
         void Start () {
             rb2d = GetComponent<Rigidbody2D>();
         }
         
         // Update is called once per frame
         void Update () {
     
         }
         void FixedUpdate(){
             Movement();
         }
     
         //Movement
         void Movement(){
             //Jump
             if(Input.GetKey("space")){
                 rb2d.AddForce(Vector2.up * jumpForce);
             }
             //Move to left
             if(Input.GetKey("a")){
                 rb2d.AddForce(Vector2.left * velocity);
             }
             //Move to right
             if(Input.GetKey("d")){
                 rb2d.AddForce(Vector2.right * velocity);
             }
         }
     }