Player jump not working correctly

I'm making a game in Unity 3D and I have this script attached to my player to make him jump when the Up arrow is pressed:

     private Rigidbody rb;
     public float jumpForce;

     void Start()
     {
         rb = gameObject.GetComponent<Rigidbody>();
         anim = gameObject.GetComponent<Animator>();
     }

     void Update()
     {
         PlayerMovement();
         Jump();
     }
 
     void Jump()
     {
         if (Input.GetKeyDown(KeyCode.UpArrow))
         {
             Debug.Log("This if works");
             rb.AddForce(Vector3.up * jumpForce, ForceMode.Impulse);
         }
     }

My player has a rigidbody attached to it and I know the if statement works because of that debug.log, however, nothing happens when I press the up arrow. Anyone know why? Let me know if you need any more info about the script or the player object. Thanks for your help!