WordPress Burbs Sort Posts by Custom Meta Value

sort.php

<?php
// short code to display by meta_key job_title
add_shortcode( 'burbs_sort_test', 'burbs_sort_test' );

function burbs_sort_test() {
    global $post;
    echo '<pre>';
    $atts = array(
        'post_type' => 'post',
        'order'     => 'ASC',
        'orderby'   => 'meta_value',
        'meta_key' => 'job_title',
    );

    $wp_query = new WP_Query($atts);

    while( $wp_query->have_posts() ) : $wp_query->the_post();
        the_title();
        echo ' -> ';
        echo get_post_meta( $post->ID, 'job_title', true );
        echo '<br>';
    endwhile;

    echo '</pre>';

    wp_reset_query();
}