Xiaomi phones (not sure about others) allow you to have two separate "spaces". Not sure how it works under the hood, but it's basically like rebooting into another Android instance - even the Google account is not shared, apps are not shared, nothing. You can switch between these spaces from lock screen simply by entering a correct password for the one you want, you can configure what notifications and when can "bubble up" to the primary space, etc. It's an awesome feature.