Threaten your way in. This is unlikely to work and anyone you threaten is more likely to call security than let you inside.
Fit in to get in. Use a disguise and you can probably convince someone to let you inside, so long as they dont look at your ID.
"I'm in". Use "hacking" and rearrange wires until the door opens for you regardless of ID. Make sure to learn the wires beforehand so you don't stand there for minutes looking suspicious as hell.
Get the ID of someone who has access. Mug, Slip, or kill a proper someone, take their ID, and use it to open the door. This has a high success rate, but will also make you get caught equally often.
Clean burglarizing. Disassemble (don't break) a window or wall cleanly to make your way inside. makes little noise but requires knowledge of construction and a good chunk of time.
a dirty break-in. Destroy a window using a weapon of some sort, or, if your VERY well armed, destroy the door or wall. Windows are much more weak to gunshots than melee weapons, so much so that if your trying to use a melee weapon your usually better off just stealing a gun and coming back.
Explosions (or fire). If you can get an explosive, you can try blowing apart the wall or window. you can also try to use a plasmafire to do the same. This is greatly frowned upon if you aren't an antagonist, but is by far the most stylish way of doing it.