Devices, systems, and methods for using a light up feature of a mobile device to trigger door access are described herein. One mobile device for using the light up feature to trigger door access, includes a display, a processor, and memory, coupled to the processor, wherein the memory includes instructions executable by the processor to lock the mobile device when in sleep mode, turn the display off when the mobile device has been placed in the sleep mode and to turn the display on when the mobile device has been placed in light up mode but the device is not unlocked, transition a door access application from a low power state to a regular power state when the mobile device is placed in light up mode, and trigger the opening of a door based on a door access protocol once the application is in regular power state.