I don't know if this question constitutes a home improvement or life hack but I'll ask here first. We live downstairs for my wife's parents in Japan. My wife's mother occasional invades downstairs. She changes around things- this infuriates my somewhat control-freak wife. Is there a device that I buy on the internet that allow a sliding door to be locked? Its a double sliding door with no internals of Japanese design- more robust that those paper doors but essential light weight wood on the wood runner with no bearings. I need non-permanent- no modifications to either door or wall. Just need to provide some resistance to entry. Its an internal door. Because there are two sliding doors- I envision perhaps a Z connection- A L with an end- the gap between the doors is 5mm- and small lock to lock the doors together. Have you seen something like that? We have a decent a hardware store at last near home but no tools.