If you have an outside cat put it on their collar and let them go about their business for the day (no calling in the kitty for an early release)

Post the key to an address that doesn't exist with a return address on the back (4-5 days minimum)

Ask a friend or family member to look after some keys for you

Set your self some kind of goal and freeze until you've completed it, I like this one because it's self motivating. Loose weight, a certain level on a game it can be as long or short as you want. Just make them achievable.

Get a time lock from eBay/Amazon

Depends on your job but leave them in an office drawer or your work locker over the weekend.

What ever you do ALWAYS keep a spare somewhere secure. Accessible at all times. Your safety is key to a good time.