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After regular user Insert the key into the lock and unlock the door, they usually do a intuitive behavior, that is we call "turn it open". But this behavior will interrupt to the original unlock action, it is easy to left the key in the door and the situation will lead the crime of theft.
In view of this, a concept came - "Hold Key", which is integrating with insert the key and open the door into one action, reducing the situation of left the key in the door, but also prevent the crime of theft happened.
Chieh- Chun Huang,