I got a scroll that says " Open 40 ~ 60 point on touch " However I cast it on a door that is locked with 70. Nothing seem to happen, what gives?

When you cast the spell, a random number between 40 and 60 will be generated. This random number will be compared with the lock level of the lock you are about to open. If the random number is at least equal to the lock level then the spell succeeds. If the random number is lower than the lock level then the spell fails.

In the other words, you cannot open a lock with lock level 70 with your spell. You will need a better spell.

Do the door magically unlock itself if the spell succeed? or do I still need to use a lockpick?

Yes, the door unlocks.

Only one note here: The spell does not remove traps from the lock. If the door is both locked and trapped, then the spell unlocks so that you can open the door but an attempt to do that will trigger the trap.
In the other words, an experienced adventurer knows that he will need a good unlock spell plus a telekinesis spell :D

Kakero, if your going to rely on scrolls, wait till you get to level 13 and up. Then, you'll get Ekash locksplitters like crazy. They are the best open door scrolls.

I'm replaying the game. This time I role play. I'm in Ibar Dad and I've found a door that got a lock level of 70. My security skill is only 34 and I happen to have that scroll but it seems it didn't do anything. So I may just ask because I never use such scroll with such spell before.

well, looks like I can't open the door anyway. I'll leave it alone. :D

"an experienced adventurer knows that he will need a good unlock spell plus a telekinesis spell"

Thats what the telekinesis spell is for? I couldn't figure out how to use it.

SilentThief

Telekinesis can be use be pick up an item far far away. That's what I use it for anyway. :D

I use "Jump", "Slowfall" and things called "Lockpicks" to acheive the same goal. easier, as then you save mana

Telekinesis can also be used for removing traps:

1. If the lock (door, etc.) is locked then unlock it first.
2. Go away and manipulate the trapped lock by telekinesis. You will trigger the trap but because you are out of its reach, you won't be harmed.
3. The trap is now removed. It is safe to manipulate the previously trapped object.