If it is new to you, it is a small 'robot' device that cleans your carpets and floors...
It moves around cleaning, and if it hits something, it will back up a bit, turn and go again...
Anyway...
First, secure you release key to the roomba, and send it on its way...
secure yourself on the floor where you are 'somewhat' mobile... IE: hog tie...
A blindfold will help to keep you in suspence so that you don't know exactly where it is, but it is a bit noisy, so you can always
hear where it is...
Now, the thing will run into you several times, the question is: can you catch it when it is in range to get your key before it takes off again???
And now a bit of warning, it can get stuck, and make sure it does not run out of juice before you get your key...

And if there was a way to launch it later, your "play time" could be longer...
Also, if you can get several, have diferent one carry diferent release keys...