A device and method for a strike plate for a door frame member and/or door assembly is shown and described. The invention may be considered a strike plate assembly and, in other embodiments, a lock strike plate with an adjustable aperture. The strike plate may fit within a mortise pocket on a door member of a door frame. The invention may include an adjustable base plate and a top plate. In some examples, the strike plate may include a first horizontally extended linear opening and a second horizontally extended linear opening. The strike plate assembly may be selectively positionable within the mortise pocket to facilitate lateral adjustability of an interior space within an interior aperture by movement of at least a portion of the strike plate laterally.