My Monk in Plat finally got this spell and I was happy to read on the wiki that it can be used to open the Graveyard Gate.

However, when I went to try it:
>prep 1207
You take a deep breath and focus inward, raising a hand and quietly murmuring the words of the Force Projection spell...
Your spell is ready.
>cast at gate
You gesture at a massive bronze gate.
The gate vibrates slightly.
Cast Roundtime 3 Seconds.

... am I missing something? Shouldn't this just pop the gate open instantaneously? Or am I supposed to get some sort of phantom roll that's high enough to do so?

Or perhaps it is borked in Plat? I've not tried it in Prime.

Ah - thanks for the clarification Estild!

Bit of a let down, though, as my mana pool is puny as-is and makes attempting to pop the gate prohibitive.

I assumed it was an automatic thing, considering how many sub-L20 critters are in the Graveyard. Would be nice to have a better chance of popping it at an earlier level.