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By hand today it felt like with the extra GT85 lubrication in there I could move it ever so slightly more (may have all been in my head), but still couldn't get it. I added even more GT85 and kept going a little more in my head thinking it would be working through. Then.... @gazza82 - wow, so as I remembered I'd put my allen keys somewhere extra 'safe'/sensible (as was using more on my bike than the car with them!) so I decided to try the same approach you recommended with a strong thin drill bit. Nervously I gently turned it, no particular pressure, first time it easily just popped open, no drama (aside from me being in shock and don't think I've ever been quite so happy to smell the waft of air freshener from the car). Thank you so much for suggesting this. Right tool for the job thing I guess and why "normal" physical keys have a greater surface, all about the turning moment. I then popped the bonnet and 'climbed' back into the boot to get to my jump starter pack. It had enough to set the alarm off a few times before dying, so giving that a charge now and will try again later. At the very worst now I have access to replace the battery, but hoping it shouldn't come to that, although knowing they don't like to go completely flat. The car has already have the larger capacity battery fitted by the dealer. Thanks all for the input and thoughts here and hope this gives further help/encouragement to anyone else who ends up visiting this thread like I did due to have this issue.

Glad the idea helped ... Not sure why the lock is so stiff unless it's the green gloop they put on everything for the boat ride from Japan!

Hi am glad you finally got into car. as I said it is a sudden freeing although i never had need to resort to allen key to aid movement although it would probably have helped me.I said before I got a CTEK charger along with this from amazon. well worth it as now can charge car anytime without need to get into car as this lead is always attached and jus need plug in to CTEK 5.0 charge unit. if your car is still under warranty I would get in contact with toyota head office- hopefully they can still reply and tell them failed battery and hopefully gain a second one replaced under warranty. but if not get it checked out by local garage and if faulty there is usually a 3 ,4 or even 5 year warranty from the battery manufacturers and contact them to get their response. -worth doing a check on battery even if seems to be holding charge CTEK Indicator eyelet M8: practical LED indicator for immediate indication of battery charge levels by CTEK

Glad you finally got in [emoji846] Sent from my SM-G973F using Tapatalk

I found threading a thin but longish allen key through the end of the key made it easier to hold and gave just enough leverage to twist that bit more to operate and unlock.

Lack of use has taken its toll on my puny stock battery (48Ah Panasonic). It wouldn't crank the engine the other day so I charged it up and it started fine. However, a voltage check shows it to be just over 12V so it's knackered and there's no fully restoring it. I can't trust it for when I really need it. I'm ordering a Yuasa 3000 60Ah replacement.