Abstract: A keeper device for a door lock which is composed of a channel form member having a web right angularly bent from the main web plane and a pair of flanges extending oppositely from the web and wherein an opening is provided in the reversely bent web portion to receive the bolt therethrough and wherein a block is provided which is sized to be received between the flanges of the channel and which is provided with a rectangular opening sized to receive an elliptical operator knob of the lock, so that when installed, the lock may not be opened from the outside or the inside unless the block is removed, and preferably, magnets are provided to keep the block in keeper relationship with the channel web.