Arcane Barrier

An invisible barrier of force springs into existence at a point you choose within range. The barrier appears in any orientation you choose, as a horizontal or vertical plane or at an angle. It can be free floating or resting on a solid surface. This plane can be up to 10 feet by 10 feet. The plane is 1/16 inch thick. It lasts for the duration. If the barrier cuts through a creature's space when it appears, the creature is pushed to one side of the barrier (your choice which side).

Nothing can physically pass through the barrier. It is immune to all damage and can't be dispelled by dispel magic. The barrier also extends into the Ethereal Plane, blocking ethereal travel through the wall.