Putting aside the issue of locking real phones this has an issue of state persisting between test runs. The previous execution of a test should not change state

Putting aside the issue of locking real phones this has an issue of state persisting between test runs. The previous execution of a test should not change state for subsequent execution. This is a long way of asking why the phones weren't unlocked as part of a cleanup step in the same test. Although, at this company, if they did this, they might not notice they were locking and unlocking phones whenever this ran and then periodically disable and enable their customers phones.