So what happens, he brings the spare key home and then forgets that....?
The only two people I know with electronic (fingerprint) door locks have both had them fail unexpectedly.
Fail safe or fail open?
Fail closed. At least, from the outside. I imagine there is a mechanical override on such locks from the inside.
My understanding was that there is a mechanical override (i.e. a key) for such locks from the outside as well?
seriously man not to be abusive but starting a thread about continuously forgetting your house keys for years is really childish. You obviously are mature enough to rent/own your flat, have a job and surviving. Have you not got a "learning curve" in regards to your keys...?
Make a mistake once, you learn from it as $200 for 10 seconds work must bite. Make the same mistake twice and surely you have to be even more smarter with your memory as again $200 for 10 seconds work must have hurt.
Don't learn it thereafter, surely you are doomed for failure in ever remembering this.
I feel sad for you as starting a forum on what you thought was innocent forgetfulness turns out ppl have made you aware of your blatant immaturity. Grow up, man up, and learn otherwise you are doomed for failure in anything else you may do...
BTW, my solution is change your door lock to a single key and place this in your rubber case for your iphone, blackberry in between the backdoor of your phone and the rubber case.
surely you are not dumb enough to remember your phone...