Lock

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

FIG. 2 is a front view of the lock of FIG. 1 .

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is an enlarged top plan view of thereof; and,

FIG. 7 is an enlarged bottom plan view thereof.

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