Abstract: A method includes receiving a first audio signal when an electronic device is locked, where the first audio signal includes a first voice signal of a user, and the first voice signal includes a keyword for requesting the electronic device to perform a first operation, performing voiceprint recognition on the first audio signal to determine a score of the first audio signal, unlocking the electronic device and performing the first operation when the score is greater than or equal to a first threshold, prompting the user to perform security authentication in a manner other than a voice manner when the score is less than the first threshold and greater than a second threshold, and unlocking the electronic device and performing the first operation when the security authentication performed by the user succeeds.