In the company I work at, we need to have our ID scanned granting access to enter doors.
When the door is unlocked, the ID scanner will lit green LED, otherwise, it lits a red LED.
There is this door to the medical center, which is usually left unlocked.
Often, there are people rescan their IDs to already a green-LED-lit door, or they just stood there patiently waiting for access or people to open the door for them

All there is to be done is to try pull open the door, it is just one pull away to entrance

How often have we stumbled at places, restrained by "common sense and perception" and just one Pull away?