add_filter( 'cron_schedules', 'cron_add_per_minute' );
function cron_add_per_minute( $schedules ) {
    // Adds once weekly to the existing schedules.
    $schedules['per_minute'] = array(
        'interval' => 60,
        'display' => __( 'Per Minute' )
    );
    return $schedules;
}

// Create the custom hook for cron scheduler
add_action( 'kallzu_test_cron_hook', 'kallzu_test_cron' );
function kallzu_test_cron() {
    echo "working";
    die();
}

if( !wp_next_scheduled( 'kallzu_test_cron_hook' ) ) {
    wp_schedule_event( time(), 'per_minute', 'kallzu_test_cron_hook' );
}