The ornamental design for a keyholder, as shown and described.
FIG. 1 is a front elevation view of a key holder showing our new design. A key is shown in phantom lines to illustrate environment and forms no part of the invention.
FIG. 2 is a top plan view thereof.
FIG. 3 is a bottom plan view thereof.
FIG. 4 is a right side elevation view thereof.
FIG. 5 is a left side elevation view thereof.
FIG. 6 is a rear elevation view thereof.
FIG. 7 is a front perspective view thereof.
FIG. 8 is a rear perspective view thereof; and,
FIG. 9 is a front perspective view thereof in a folded condition.