Close Portal

None step through, not even us

Requirements
Carved symbols along the entirety of the portal's edge, including the floor
Anything with which to make a hand print on the portal barrier's surface (door, portcullis, rune covered wall, etc)

Vessel
A lock of good make

Whether it is mystical or mundane, until midnight, none may step through.
It acts as a completely solid, unbreakable wall for the duration.