1. no access to the cli,
2. no persistent processes
3. no chmod - physically set write permissions in cpanel or equivlent.
4. Small scale single node installations.

1. Mail Queues.
2. Sms Queues.
3. Thumbnail Generation.
4. PDF Generation.

1. Written for php 5.3.
2. Written with Symfony2 components and Doctrine DBAL.
3. Uses Cron scripts for workers and metric generation.
4. Can Run many workers.
5. Multiple queues per script if needed.
6. Records state transitions into the database as activity which drive Metrics.
7. Installed via composer.

Install via composer

 "require" : {
        "icomefromthenet/laterjob" :"dev-master"
 }

I would start at the docs.