Wordpress get post by slug and post type

extras.php

/**
 * Retrieve by its slug
 * @param  string $slug      Slug of the post
 * @param  string $post_type Post Type
 * @param  string $output    Type of output
 * @return mixed
 * @author Markus Schober
 */
function bb_get_post_by_slug($slug, $post_type = 'post', $output = 'OBJECT') {
    global $wpdb;

    $post = $wpdb->get_var( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_name = %s AND post_type = %s", $slug, $post_type ) );

    if ( $post ) {
        return get_post( $post, $output );
    }
}