The ornamental design for a lockholder, as shown and described.
FIG. 1 is a perspective view of my new design for a lock holder;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left view thereof;
FIG. 5 is a right view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is another perspective view thereof;
FIG. 9 is the other perspective view thereof; and,
FIG. 10 is a perspective view thereof, shown in a state of use.
The broken lines in FIGS. 1-9 illustrate unclaimed portions and the broken lines in FIG. 10 illustrate the environment of the claimed design. None of the broken lines forms part of the claimed design.