No, if you pause your ride outside a docking station or zone you will not be charged.
However, if you end your ride in the app or the ride ends because the 15 minute period has passed, you'll be charged out of dock or out of zone fees if applicable based on the current bike location.
Although you won't be charged out of dock fees while your ride is paused, please make sure to park your bike in a considerate place even if you're only leaving it for a few minutes on pause.