Once paired, you can unlock your Mac remotely using your iPhone or Apple Watch. Also you can wake the Mac and open the app on your device and you Mac will be automatically unlocked. Also, you have the option of having your Mac automatically lock when you walk away with your paired device.
This app is an alternative to typing in your password or using the builtin Touch ID on the MacBook Pro. Near Lock works perfectly with you Mac without a painful setup process. You can download the Mac app here and the iOS app here.