Yes, but what are ways it is possible to break into a car?
Break a window (drawback: sets off a car alarm)
Duplicate or steal the a key (drawback: requires original key)
Steal car when open (drawback: not many people leave there car open)
How could you break in a Lockitron (or prevent someone from using it)?
Steal a persons phone (much easier than stealing a key. A phone is taken out more often than a set of keys)
Cut telephone wires for wi-fi (a little extreme, but possible)
Hack there password.
Besides, how much motion does it require to open a lock with a key? I guess it makes sense to use it to unlock or lock your house remotely, but when have you been in that kind of situation? If someone needs a key, just give them a copy.
Duplicate the a key (drawback: requires original key) Steal car when open (drawback: not many people leave there car open)
How could you break in a key