operating a point of sale terminal in point of sale mode;

receiving captured sensor data;

detecting, based on the captured sensor data, a person proximate a point of sale terminal;

determining that a category for the detected person proximate the point of sale terminal is an authorized store clerk category using biometric data stored for people in the authorized store clerk category;

initiating a transaction in the point of sale mode;

receiving further sensor data during the transaction;

determining, based on the further sensor data, that the detected person is no longer proximate the point of sale terminal; and

based on the determining that the detected person is no longer proximate the point of sale terminal, pausing the transaction.