Warp is frequently called on to do things it cannot, by the basic definition of the power, do (such as change the color of a thing, or open a complex lock). The key to working up such abilities is often Perception, which expands the Demon's capabilities to the point where they can actually perceive the thing they need to Warp (molecules, internal lock mechanisms, et cetera). The GM should make a point of examining the various ways in which the player envisions lock working and require as many or as few Perceptions as appropriate for the abilities.