i mean, if i was the referee, and they weren't in that architecturally precarious situation, i'd think that's a mighty fine solution to the puzzle, actually.

I bet nobody has tried to just open the door.

The worst one would be a petrified tree. They're a massive cylinder that looks like the roof of the cave, and then it falls loose and smashes you.

Here is a good visual representation of this.

Aren't stalactites made of soft material?

Just pickaxe your way beside the door. Heck, an axe may work if you don't mind destroying it in the process.

If you have spell for creating water somehow, use Roman technique of making a campfire against wall, letting it warm up and the splashi g it with water to crack it.

There's so many ways to be a menace to DM xD

The secure perimeter fallacy strikes again

How the fuck are they "in" a stalactite?

The dwarven lockpick (Adamantium hammer) is an adventuring staple for a reason; its fun and empowering to pick locks barbarian style.