The ornamental design for a doorstrike, as shown and described.
FIG. 1 is a perspective view of a door strike showing our new design.
FIG. 2 is a top view thereof.
FIG. 3 is a bottom view thereof.
FIG. 4 is a front view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a right side view thereof; and,
FIG. 7 is a left side view thereof.
The broken lines depict portions of the door strike that form no part of the claimed design.
The door strike is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design.