Abstract: An exemplary keyboard includes a row-and-column scanning matrix and a lock switch. The row-and-column scanning matrix includes a controller including a plurality of input ports and output ports, a plurality of keys electrically connecting the plurality of input ports to the plurality of output ports of the controller via a plurality of row conductive lines and column conductive lines when actuated. The lock switch connected in series with one or more of the plurality of keys is configured for disabling the one or more of the plurality of keys when opened.