Use Layers to Unlock Individual Objects

For many people, the first shortcuts they memorize are used to lock and unlock objects. Unfortunately, Command-2 (PC: Control-2) will lock one object, while Command-Option-2 (PC: Control-Alt-2) will unlock all objects. Sadly, there is no keyboard command to unlock just the last object that you locked a moment ago. The Layers palette offers a great alternative: Expand the layer by clicking on the triangle beside the layer's name, and then click the Lock icon to the left of the individual sublayer (object) you need to work with. (This only works if sublayers are locked, rather than the entire layer being locked.)