I was doing a few jobs for an auld one that had moved into sheltered accommodation. There were two doors there that opened towards each other and the handles were chipping the paint off the opposing door when they clashed. It just needed something to restrict the amount that one of the doors could open. I thought about using the sort of thing that you sometimes get on cupboards and bureaux - a sliding bar that comes to a stop, limiting the movement. I couldn't think what the 'official' name might be and (luckily) she didn't have the internet anyway - so I had to wait until I got home. The idea was to Google for images, until I found one that looked up to stopping a 'full-size' door, rather than the more lightweight type that are fairly common.
I thought 'door restraint' was a suitable place to start, but was surprised to find that about a quarter of the images involved young ladies who had somehow managed to become strapped to doors, even before they had managed to get dressed at all, in most cases...