There is no way you can sign out a user even via the Admin SDK. All sign-out operations must happen from the device on which the user is signed in. This means that you cannot revoke an access token once it is minted.
Please also note that even if you disable the user's account in Firebase Console, the user may continue to have access for up to an hour. If you don't want that to happen, then you can implement a lockout system as explained by @FrankvanPuffelen in the following answer: