1. A method of authenticating a user of an electronic device, the method comprising: capturing, by one or more sensors of the electronic device, a plurality of biometric images in succession over a period of time while the user is interacting with a user interface of the electronic device to input user data for a non-authentication operation; for each image of the plurality of biometric images: (1) determining, by a processor of the electronic device, a key of the user interface, the key selected by the user while interacting with the user interface, the key associated with the capture of the image; and (2) determining, by the processor of the electronic device, a finger corresponding to the key of the user interface; determining, by the processor, whether the plurality of biometric images correspond to a single finger of the user; in response to the determining that the plurality of biometric images correspond to the single finger of the user, selecting, for comparison to the plurality of captured images, by the processor of the electronic device, at least one reference image from a plurality of reference images based on the single finger of the user corresponding to the plurality of biometric images; comparing, by the processor of the electronic device, the plurality of biometric images with the at least one selected reference image; and authenticating the user for access to the electronic device based on the comparing.