enqeue_script not working in plugin

I have the following code in my plugin. The problem is that it does not enqeue jquery and the scripts. This is the code

add_action('wp_enqueue_scripts', 'my_scripts');
function my_scripts() {
	global $post;

	wp_enqueue_script('jquery');

	//register and enque scripts
	wp_register_script('myjs_script', plugins_url('js/myscript.js', __FILE__), array('jquery'));
	wp_enqueue_script('myjs_script');

	//register and enque styles
    wp_register_style('myjs_script_styles', plugins_url('css/my.css', __FILE__));

    wp_enqueue_style('myjs_script_styles');

}