Magical Spells - Can I Crush the Lock?

We start in building number one, the headquarters. No sound can be created within or passed through a 20 foot radio sphere centered on a point you choose,. What if cach that at the door and the and then you beat the shit out oe, he's the phantom fist. The next stop is building number three because we can hear people there. We know that there's like at least more than one. And as an action, i can switch between seeing and hearing. Good news, not dogs.