How do I go through a door opening?

Solution 1:

The game looked fun and I wanted to read some info about how to begin and such. And I think I found your awnser in this guide: http://guidescroll.com/2013/04/warframe-essential-beginners-tips/

Corpus Mission Tips

If you find your way blocked by a Laser Barrier, there is most likely one or more security cameras around that detected a hostile target.

Look for green (non hostile cameras) or red (hostile camera detecting your or your teammates) on the ceiling nearby and destroy them to shut down the barrier.

Tiplet: if you cannot find the security camera, move the whole team somewhere to try to get out of the camera’s detection. Then either make a dash for it or try to deduce where the cameras are.

Also, it is possible to bypass an active Laser Barrier by using some powers (from wiki: Excalibur‘s “Slash Dash,” Rhino‘s “Rhino Charge,” Loki‘s “Invisibility,” and Trinity‘s “Link“) or sometimes by sliding (though not very reliable for the beginner)

This is how it looks when it has not detected you:

When it has detected you it will glow red and follow your movement.

Solution 2:

Roll through it, but you still will take extremely minimal damage. Go right in front f it, then roll.