Which level is it the second ?
Most of the doors early on are opened by either walking upto them and using a Charged force push to smash them open or by holding the right mouse button and either holding the W key to move the door up or pressing the corresponding on screen key, usually displayed after u have held the right mouse button, sometime tho you may need to use both ther keys and move the mouse in order to open certain doors.
Without knowing the exact level ur on im a little lost as to where you mean since there are many such places in the game that sound like you have described... I hope this helps if not please come back and post the exact level ur on and if possible a rough estimate as to how for into the level you are
Happy gaming
Regards
Dj
Don't forget the doors where you need the breaker or battery (whatever those things are) where you have to use the force hold and lift move the battery over to the slot next to the door and blast it with force lightning either while moving it to the slot or once you've put it in there. A lot of the times the battery/breaker was either next to the door or you had to barrow one from something else in the room.