Lock

FIG. 1 is a front view of a lock in accordance with my new design;

FIG. 2 is a back view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a left side view thereof; and,

FIG. 7 is a front side perspective view thereof.

The broken lines form no part of the claimed design.