Now that we've settled on a bike light, what lock should I buy?

[olnacl]

Now that I'm (again) unemployed, taking my bike to the store seems like a double benefit - exercise and no gasoline expense. Only, it would last but a New York minute outside the grocery store. After seeing all the lock picking videos on uTube, I'm wondering what is the best choice for keeping it safe other than leaving it at home in the locked garage, (Which sorta defeats the purpose, you know?)