Cronjob in Laravel 5

I have the job table contains post_at,day_open,block properties

• The post_at property is the day when user post the job (Ex:2015-11-24)

• The day_open property is the day that job is open (Ex:10)

• The block property can contain 2 values 0 or 1. If post_at + day_open > right now the block value will change from 0 to 1

So how can I do that using cronjob?

via Chebli Mohamed