How to change password when jupyterlab is running?

I want to share my jupyterlab to someother for some time.
So I need to share him the link with token, so that he can login and do some operation.
When the other one slove the problem, I need to change the password.
But I don’t want to stop the jupyterlab and restart. Because there may be some job keeping running.

So actually my question is how to share my jupyterlab to others for just some hours.

anybody can help on this?