lib/Kue/Scheduler.php
function cron($expression, Job $job)
    {
        $expression = new CronExpression($expression);
        $this->add($expression, $job);

        return $this;
    }
function cron($expression, Job $job)
    {
        $expression = new CronExpression($expression);
        $this->add($expression, $job);

        return $this;
    }
Schedules a job with a CRON expression.

@param string $expression CRON expression
@param Job $job

@return Scheduler