Logging in as / 'impersonating' user 🛂

I'm currently only allowing google sign ups to the user in the UI. For customer service purposes, I'm thinking of having the ability to log in as a particular user in the front end and perform actions for them. Is this possible / encouraged? One solution I can think of is to allow email/password login but only for admins (aka, myself). Anyone has had similar user cases / solutions?

Thank you!!