1. An electronic device, comprising: a biometric sensor; a display; one or more processors; and memory storing one or more programs configured to be executed by the one or more processors, the one or more programs including instructions for: while the electronic device is in a locked mode of operation in which access to a respective set of features of the electronic device is locked, detecting, with the biometric sensor, a first input that corresponds to a request to initiate unlocking the electronic device; and in response to detecting the first input with the biometric sensor: determining whether the first input meets one of unlock criteria, first unlock-failure criteria, or second unlock-failure criteria; in accordance with a determination that the first input meets the unlock criteria, transitioning the electronic device from the locked mode to an unlocked mode in which the respective set of features of the electronic device is unlocked; in accordance with a determination that the first input meets the first unlock-failure criteria, maintaining the electronic device in the locked mode and adjusting unlock settings so that the electronic device is enabled to be unlocked via an unlock operation in a first set of one or more unlock operations; and in accordance with a determination that the first input meets the second unlock-failure criteria, maintaining the electronic device in the locked mode and adjusting unlock settings so that the electronic device is enabled to be unlocked via an unlock operation in a second set of one or more unlock operations that is different from the first set of unlock operations.