Use an IR remote to toggle eight relay channels in a low-voltage demonstration, leaving mains design and installation to qualified professionals.
Build a timed code-entry game with consistent indicators and non-blocking timing; it is a game rather than an access-control system.
Decode the actual button codes of an IR remote and toggle four current-limited LEDs while handling repeat frames and debounce.
Combine buttons and an IR remote to operate a tabletop servo latch as an educational state-machine exercise, not a secure safe.