Excuse me for the delay, I managed to get to the dumpster area where I found a keycard? (if I'm not mistaken)
But I ran out of bullets multiple runs, its a problem someone already mentioned so I didn't want to bring that up again since I'm sure you are aware of that. I would suggest making the enemies drop more ammo or at least increase the chances and also make the guns on walls cheaper to buy.
Oh, no problem. I'm not aware if you already downloaded it but there is a new patch where the lack of ammo and drop was fixed, so now It's easier and more fun to play.. so if you didn't check that already I recommend giving it another try and make it to another building behind the gate with access point where the access card is needed, and then you can use there an electric switch (and unfortunately it's not the car key haha).