Set a code that must be entered to gain access.
If the correct sequence is entered, grant access.
Tip: Change the class to "open" and the text to "Access Granted"
Show which buttons have been pressed so far.
Have the panel automatically reset after a period of time inactive.
Show a countdown timer for the reset.
Show on the panel how many presses the code needs.
Show how many presses have been made or how many remain.
Show if the entries that have been made are correct up to that point.