The ornamental design for a lever for a latch, as shown and described.
FIG. 1 is a front perspective view of a lever for a latch;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a rear elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a right side elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken line showing of the lever for a latch in FIGS. 1-8 is for the purpose of illustrating portions of the article and forms no part of the claimed design. The dash-dot lines shown in FIGS. 1, 2 and 5-8 delineate the boundary line between claimed and unclaimed subject matter.