Automatically Expire Listings After Their Closing Date

// Post type and the meta key holding the closing date (Y-m-d or Y-m-d\TH:i).
$wpide_expire = array(
    'post_type' => 'job',
    'meta_key'  => '_job_valid_through',
);

add_action( 'init', function () use ( $wpide_expire ) {
    register_post_status( 'expired', array(
        'label'                     => 'Expired',
        'public'                    => false,
        'protected'                 => true,
        'exclude_from_search'       => true,
        'show_in_admin_all_list'    => true,
        'show_in_admin_status_list' => true,
        /* translators: %s: number of items */
        'label_count'               => _n_noop( 'Expired <span class="count">(%s)</span>', 'Expired <span class="count">(%s)</span>' ),
    ) );

    if ( ! wp_next_scheduled( 'wpide_expire_listings' ) ) {
        wp_schedule_event( time() + 300, 'hourly', 'wpide_expire_listings' );
    }
} );

add_action( 'wpide_expire_listings', function () use ( $wpide_expire ) {
    $ids = get_posts( array(
        'post_type'      => $wpide_expire['post_type'],
        'post_status'    => 'publish',
        'posts_per_page' => 100,
        'fields'         => 'ids',
        'no_found_rows'  => true,
        'meta_query'     => array(
            array( 'key' => $wpide_expire['meta_key'], 'value' => '', 'compare' => '!=' ),
            array( 'key' => $wpide_expire['meta_key'], 'value' => wp_date( 'Y-m-d' ), 'compare' => '<' ),
        ),
    ) );

    foreach ( $ids as $id ) {
        wp_update_post( array( 'ID' => $id, 'post_status' => 'expired' ) );
    }
} );

add_filter( 'display_post_states', function ( $states, $post ) {
    if ( 'expired' === $post->post_status ) {
        $states['expired'] = 'Expired';
    }

    return $states;
}, 10, 2 );