Mechanical keys with transponders are even easier to clone but their range is very short (the transponder has to be literally inside the antenna) so a distant a

Mechanical keys with transponders are even easier to clone but their range is very short (the transponder has to be literally inside the antenna) so a distant attack is almost impossible, smart keys on the other hand have the same range as the remote, its only limited by the range of the transmitter in the vehicle, if you touch the door and amplify that signal and the keys are close enough to pick it up, it will answer by unlocking the doors.