Sure, be able to read and write code can go a long way towards becoming a good hacker. But when it comes to simple penetration testing sometimes all you need a little ingenuity.
For example, if someone were testing the physical security of your building, or your office space, then obviously no programming skill are required. What is required is a way in, and often times getting inside is about as easy as walking in the park.
Head over to Forbes and read their story, "The No-Tech Hacker," where you can learn a bit about some of the escapades of Johnny Long, who you might know as the creator of the Google Hacking Database.
Did you know that you might be able to get a locked door to open by using a wet washcloth on a hanger? Read the story to find out more.