Lock

FIG. 1 is a front perspective view of a lock, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is an enlarged right view thereof;

FIG. 5 is an enlarged left view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate the portions of the lock, which form no part of the claimed design.