Better unlocking schemes?
Maybe you're looking for something like NFCSecure.
You can combine normal lock screen (i.e. swiping) with an underlaying NFCSecure lock screen for better security (only lets you in when scanned the needed NFC tag).
Your smartphone needs NFC capabilities and you need an NFC tag to carry around with you to unlock your phone.
Can not test this as my phone doesn't have NFC capabilities.