Facebook doesn’t just lock the shared account. Their “Unrecognized Login” system often places a temporary block on the trying the login. That means even if you later try to log into your legitimate Facebook account from that same phone or laptop, you may face additional verification steps or a 24-hour cooldown.

: Even if a password is correct, Facebook will almost certainly trigger a Two-Factor Authentication challenge or a "Identify photos of friends" check that a stranger cannot pass. Security Risks of Searching for Shared Logins

If you want, I can: