Dodi's Dirt Hut

Four non-magical walls of solid earth spring into existence surrounding the point you touch, creating a pyramid around you. The walls are 1 1/2 foot thick and 15 ft wide at the on each side at the base, connecting at the apex of the hut 15ft in the air. 

If the wall cuts through a creature’s space when it appears, the creature is pushed to one side of the wall (creature's choice). If a creature would be surrounded by the walls (or the wall and another solid surface), that creature can make a Dexterity saving throw. On a success, it can use its reaction to move up to its speed so that it is no longer enclosed by the structure.

It can’t occupy the same space as a creature or object.  It must merge with and be solidly supported by the earth, it cannot be cast on a surface other than earth (ei water, stone, lave, etc). You can crudely shape the structure to create up to one entrance and two windows.

The wall is an object made of earth that can be damaged and thus breached. Each wall has AC 10 and 2 hit points per inch of thickness (36/wall). Reducing a wall to 0 hit points destroys it. Destroying two walls destroys the structure, restraining anyone inside the hut. 

Only one hut can be in existence at a time, the creation of a second hut rapidly increases the deterioration of the previous hut. All dirt huts return to a mound of dirt in one week.