I can buy a BLE module for around $5 today, and build a keyless lock with it for around $20. In onesies, not bulk. The only two technically difficult parts, in my opinion, are power (battery? wall? moving a deadbolt is not entirely trivial from a power consumption point of view) and security. Get those right and in bulk it might cost $5 to manufacture today. Or maybe $10. It won't take ten years, not from a technical or cost point of view.
The really difficult part, to be honest, is the interface (how you open it, how any "app" or whatever looks like, how automatic things are, what kind of security is expected, how convenient it is, even how it looks.) Learn from Apple. If you design something right, it might look trivial to make, and it might have relatively simple internals, but the really hard part is getting it good enough for your average customer to use it. Making it simple is far more difficult than making it complex.
One has to figure out the real problem, and the simplest solution to solve it. (Okay, "problem" here means "thing we want to solve" not "a pressing concern in our lives"; obviously this is not a real issue for most people. That's not important here.) Problem: it's inconvenient to carry around keys, and it's even more inconvenient if your hands are full. Solution: have a door that unlocks by itself whenever you want it to, and requires no extra key. Assume smartphone (reasonable assumption in this part of the world; I get it, you're a special snowflake using a dumbphone for cost reasons or whatever.) Assume default behavior (door unlocks in the presence of an authorized smartphone, locks when smartphone exists proximity), and allow user to change behavior to various other presets (write an app). Security would be implemented invisibly to the user (asymmetric crypto using a standard authentication protocol over wifi/bluetooth/etc) unless you want another component (fingerprint, password, etc) which is optional (a key requires no more security than simply having the key, so this wouldn't really be worse; lockpicking is analogous to protocol-hacking.) Feel free to replace "phone" with "keycard or any other RFID/bluetooth/wifi-enabled device" if you wish.
Now, all _that_ engineering work is what makes a door lock $200 or whatever today, and $20 in the future - the R&D is paid for, other companies copy the already developed solution (which requires maybe 5% of the resources as developing it), blah blah. The tech part is already dirt-cheap.
Okay that was fun. Sorry. Back to work.