YOUR CHI IS YOUR KEY = NO CHI NO KEY
The Key is Your Chi-Qi-KI to unlocking the doors.
Chi the dragon of Chinese myth
Ch'i, or Qi, the "Energy Force" subtly referenced in things like Star Wars or as Q in Star Trek (Q also wears the black saturn square hat in an episode, oh yeah and there is the Borg Cube etc).
Qi-Chi-Key-KI = Mana = Prana = The Force = Spirit-Soul = (E=MC^2) = Breath of God etc.
This is the 5th Element.