cron not running

I have this code in functions.php.
It is working fine on my test site but it isn’t running on my live site. Could there be something preventing crontal from working?
add_action(‘cron_topvideo_insert_hook’, ‘cron_topvideo_insert’);
if ( ! wp_next_scheduled( ‘cron_topvideo_insert_hook’ ) ) {
wp_schedule_event( time(), ‘hourly’, ‘cron_topvideo_insert_hook’ );
}
function cron_topvideo_insert() {

$insert_statement = “INSERT into…”;

global $wpdb;

//clear the wp_clear_page_cache

$wpdb->query($insert_statement );

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