Dagger of Denial

{x}The wielder has a +2 bonus to attack and
damage rolls made with this weapon
{t}While attuned to this dagger, the wielder
can spend an action to place the point of the
blade into any keyhole and seal it shut
{t}Attempting to seal a different keyhole
unseals any previous sealed keyholes
....yes, obviously i tried pulling. It won't budge!