How To Open The Doors Of Perception At Will, Without Psychedelics

“The door to the soul is unlocked; you do not need to please the doorkeeper, the door in front of you is yours, intended for you,  and the doorkeeper obeys when spoken to.” -Robert Bly

What if you found out there was a key that would enable you to open and close your doors of perception at will, void of psychedelics? What if you found out you not only held the key, but you were the key? Would you unlock the doors, or keep them shut?