Key Fob for a Bicycle

Hello all! I'm going to be shopping for a bicycle here in a week or two, and based on a conversation I had with someone I'd like to know if anyone has done this, or if it's even possible:

Making a key fob for a bicycle. Even though having a locking mechanism on a bike itself is a dumb idea I'd just like it for kicks. Y'know, after I've chained up my bike somewhere outside a store, turn around and "lock" it like a car as I'm walking away.

Seems possible, but I just don't know how to go about this. Anyone have any ideas?

Thanks for your time and effort!

Aron3135 years ago
Not really any ideas. But what bike and why not buy a chain lock?

Check out this mtb video if you like biking!