Why won't my Laravel 5.2 events queue to Redis?

Locally, my Laravel 5.2 project works well, including events that are queued using Redis.

But I've deployed my project to a production server (where I'm using a Laradock Docker setup).

There, on production, Redis works for caching and for delayed dispatching of jobs.

So I know that my Redis setup is good.

But events don't work (even though they worked when my project was on my local computer).

My question is not a duplicate of Laravel 5.2 event not firing in production because I'm not using broadcasting and because I am using Laradock.

I've also already tried these commands (inside the container at docker exec -it laradock_workspace_1 bash):

php artisan config:cache
php artisan clear-compiled
php artisan optimize
composer install --no-dev
composer dumpautoload
php artisan queue:restart

via Chebli Mohamed