The ritual Unseen servant says:
You conjure a Medium unseen servant of invisible force. It obeys your commands, moves at your speed, can lift up to 100 pounds, and performs basic functions and repetitive tasks, such as cleaning, making camp, and moving, holding, or carrying objects.
An unseen servant never tires. It cannot move more than 20 squares from your space. It does not occupy any space and cannot attack or be attacked. Each unseen servant you currently control doubles the component cost to create the next.
I would like my party to stand a few squares away from a door, crossbows aimed at the door and command an Unseen servant to open it. Can I do this (assuming the door is untrapped and unlocked)?