According to what I have read, and I understand, it is the following:

NPC bank_booth = getNpcs().closest(6943);
bank_booth.interact("Bank");

But this hangs the bot and I have to close it forcibly.

Attach the image of the error shown in consolta by osbot.org.

Well if your using bank booth that's a object not a npc, I would suggest you don't use ID's and use Strings instead 

null check before you interact

 

final RS2Object bankBooth = script.getObjects().closest(new NameFilter<>("Bank booth"));

if (bankBooth != null) bankBooth.interact("Bank");

I'm assuming something like this is what you're after.

12 hours ago, 01053 said:

final RS2Object bankBooth = script.getObjects().closest(new NameFilter<>("Bank booth"));

if (bankBooth != null) bankBooth.interact("Bank");

I'm assuming something like this is what you're after.

you don't need the filter, just "Bank booth" is fine.

solved, thanks to everyone, I was acting like an idiot.