You need to start by meditating before hand on the effect of the spell for at least 15 minutes.

Then, to cast, you sprinkle holy (consecrated to the Lord and Lady)

water mixed with salt and powdered iron; (try potteries to get this)..

 Stand in front of the door that you want to lock...

or in the case of a person the 3rd eye point which is between the eyebrows just above their level.

Then place your hands on the 3rd chakra point or door and concentrate your energies
going down your right arm and going through the door and back into your left arm.

Then you start chanting over and over:

"Portal be controlled and mine,
Become as one with my mind,
I hold thee fast, To make this last,
open you not, as I weave the knot,
of my power from within."

Keep chanting this as you build up power, and imagine the circle of energy (right arm through door back into left arm) getting faster and faster.

 Then upon release, visualize a green field of
energy coming up in front of the door or the 3rd eye chakra.