This is all mostly irrelevant though, and all of this discussion involves ex post facto analysis. The test for patentability is would a person skilled in the art come to the same solution without an inventive step - is the claimed invention what someone familiar with the art of human computer interaction do without doing something new. I would argue that the answer is no: there are many well known mechanisms for unlocking an electronic device (a pin, a password, a fingerprint, an identifying card or dongle, and so on) - using an analog of something that exists in the physical world such as a latch is not what someone skilled in the art WOULD do, there is some invention in taking the physical and bring it into the digital.