PlayerController Generic

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

    private float xDir = 0;
    private float yDir = 0;
    private Rigidbody rigidbody;
    private bool controlsLocked = true;

    public float speed;
    [RangeAttribute (1, 10)]
    public float sensitivity;

    void Start() {
        rigidbody = GetComponent<Rigidbody> ();
        rigidbody.freezeRotation = true;
        Cursor.lockState = CursorLockMode.None;
        Cursor.visible = true;
    }

    void FixedUpdate () {

        if (!controlsLocked) {

            if (Input.GetKey (KeyCode.RightArrow) || Input.GetKey (KeyCode.D)) {
                rigidbody.velocity = transform.right * speed;
            }
            if (Input.GetKey (KeyCode.LeftArrow) || Input.GetKey (KeyCode.A)) {
                rigidbody.velocity = -transform.right * speed;
            }
            if (Input.GetKey (KeyCode.UpArrow) || Input.GetKey (KeyCode.W)) {
                rigidbody.velocity = transform.forward * speed;
            }
            if (Input.GetKey (KeyCode.DownArrow) || Input.GetKey (KeyCode.S)) {
                rigidbody.velocity = -transform.forward * speed;
            }
            if (Input.GetKey (KeyCode.Space)) {
                rigidbody.velocity = transform.up * speed;
            }
            if (Input.GetKey (KeyCode.LeftShift)) {
                rigidbody.velocity = -transform.up * speed;
            }

            xDir += Input.GetAxis ("Mouse X") * sensitivity;
            yDir -= Input.GetAxis ("Mouse Y") * sensitivity;

            rigidbody.rotation = Quaternion.Euler (yDir, xDir, 0.0f);
        }
    }

    void LockControls() {
        controlsLocked = true;
        Cursor.lockState = CursorLockMode.None;
        Cursor.visible = true;
    }

    void FreeControls() {
        controlsLocked = false;
        Cursor.lockState = CursorLockMode.Locked;
        Cursor.visible = false;
    }

    void ResetPosition() {
        rigidbody.position = new Vector3 (-2, -2, -2);
        xDir = 0;
        yDir = 0;
    }
}