"Q: Our house is approx 20 y/o. We have lost the key to the bathroom. None of the stores in this area that I visited have a replacement. Where can I buy one? A:? Usually, bathroom doors use a privacy lock which is unlocked quite easily with a hairpin or something similar. To get the actual generic key that came with the lock originally, you'll need to check with the manufacturer of the lock. This may be difficult to find as not all manufacturers mark their hardware so that it is easily recognizable. Often times the door hardware brand will be stamped on the mortise plate (rectangular plate around the latch) Or, you may try taking it apart to see if there are any markings on the interior. The only other option is to take it to a hardware shop and see if they can recognize it or email us some photos and we'll give it a shot."