Erm...first time I tried it, on the cafe door, it was a piece of piss...only takes two keys being pressed! What the hell are you doing t make it so hard!
Can you go into the little details?
I hold Up. The pin turns green. I press Left while holding up. Sometimes it works, sometimes it doesn't.
If it doesn't work, I try releasing Up, then very quickly pressing Left. Sometimes it works, sometimes it doesn't.
At that point I gave up and used a controller. I actually got as far as getting 4 out of 5 pins unlocked, and then I screwed up the last one, and then screwed up again until it was back to square one.
My friend who has a fancy $170 gaming keyboard with anti-ghosting reports no issues, which is why I suspect keyboard ghosting might be a factor. It feels like the game just isn't responding to the keypresses properly. I also had a "ghosting" problem once playing battlefield on my laptop when I couldn't hit my afterburners (mapped to shift) while holding down W and D at once, unless I released one of them.