Your best bet is to get someone else to look after them and shut the door to your computer room. They would otherwise be a huge distraction and want to be played with (depending on age of course).

I use supergenpass which works in a similar way. I would not use this for production passwords though as they often need changing which lesspass or supergenpass do not support

The keyboard shortcuts are very useful and my favourite feature. Along with plugin support, it's my favourite.

It's also interesting to note that this article is over 10 years old but it's still relevant today

Learn the three rules of TDD and stick to them