Abstract: An adjustable bar lock for use between an abutment member and a slidable member. The bar lock includes a base attached to the abutment member and an adjustable bar comprising a rigid first link pivotally attached to the base and telescopically connected to a rigid second link. The second link has a free end adapted for abutting the slidable member with the bar in a locked position. A retainer clip adapted for attachment to the abutment member is provided for releasably securing the adjustable bar in a pass position, whereby the slidable member may be moved from a closed to an open location. The adjustable bar is foldable between the locked and the pass positions.