Just let yourself in and wait for me. But, I don't have a key. Just use your VISA card to slip the lock. Better check your spaces and see if the VISA trick works on your door. Here's something else.
Many computers come with a keyboard lock.
You need to take even your simple access control devices seriously. If you don't, they aren't working for you, and you might as well not have them there. However, there isn't much sense in locking your doors if you leave your badge hanging around where it shouldn't be. For example, at the gym where I work out, I can almost always walk into the men's locker room and see jackets hanging on hangers in the common area. All too frequently I see badges hanging from the pockets of those jackets.