Lock

FIG. 1 is a top front left perspective view of a first embodiment of a lock showing my new design; FIG. 2 is a top rear right perspective view thereof; FIG. 3 is a bottom front right perspective view thereof; FIG. 4 is a bottom front left perspective view thereof; FIG. 5 is a front view thereof; FIG. 6 is a right side view thereof; FIG. 7 is a rear view thereof; FIG. 8 is a left side view thereof; FIG. 9 is a top view thereof; FIG. 10 is a bottom view thereof; FIG. 11 is a front right perspective view of a second embodiments of a lock showing my new design; FIG. 12 is a top front left perspective view thereof; FIG. 13 is a bottom front right perspective view thereof; FIG. 14 is a bottom front left perspective view thereof; FIG. 15 is a front view thereof; FIG. 16 is a right side view thereof; FIG. 17 is a rear view thereof; FIG. 18 is a left side view thereof; FIG. 19 is a top view thereof; and, FIG. 20 is a bottom view thereof. The broken lines represent portions of the lock that form no part of the claim.