Not as easy as they make it look on TV it takes some practice but it does work
bottom line

For my Security customers who are worred about such instances I will install for them high level security locks such as Medico, ASSA etc.
they have unique designed keyways and blanks are not available to public.
only certified locksmiths who are extremely penalised should they cut a key for wrong person.

In extreme security concerns customers can even get specail made one of a kind
key ways just for there buisness.
the high security locks come in several levels of security feattures and restrictions on purchase availability. such as having to present photo ID along with a specail card issued with lock.