Old News and old technique
Using a hammer is for troglodytes. A competent lock cracker freezes the lock and then uses a "nut-splitter" or similar high pressure/mechanical advantage tool to shatter the lock cylinder nearly noiselessly - except for the pop when it shatters. Which can be padded around to reduce even that sound. A good nut-splitter can generate 100K+psi. Some locks don't even have to be frozen.