Apple Passcode Lock time limit does not work?

My iPhone 4 gives me the option to wait 1 minute than the passcode will be asked. It has been 5 minutes and I've not been asked. Help please?

Added (1). My phone has been sitting open for five minutes and I can do whatever

No you misunderstood. After you type in your passcode. You can lock and unlock your iphone without it asking for a passcode for 1 minute. It is not a time limit for it to ask for your passcode. It is a set time where you can unlock it and it won't ask you for a passcode for a whole minute no matter how many times you lock it

Retart it