How do I query by geolocation in Laravel 5?

I am looking to add a geolocation attribute to my "Candidate" Eloquent model. I want to find Candidates based on their location. For instance, find all Candidates within 20 miles of San Francisco. What should my Eloquent model look like to store a location in the database?

How do I query for candidates based on their location? I am using Laravel 5.3.

via Chebli Mohamed