I'm locked out of my room with no key. What are my options?

You said room and not house so that indicates to me an interior door rather than one to the outside, plus there isn't a deadbolt. If you're really lucky the hinge pins are on the outside and all you'll need is a flathead screwdriver and maybe a hammer to remove them and simply pop the door that way. That's the best, cheapest, and fastest solution, but doors are not usually installed that way.

Because it's winter in the Northern Hemisphere (I forgot to check where you are), everything is as small as it is likely to get due to seasonal shrinkage and you might be able to pry the door open without damaging it or the frame. Gently work a flat pry bar or stiff putty knife right above the strike plate in the jamb and try to nudge it away from the door in order to get the plunger to release. This is more difficult in the late spring and summer because wood swells up a bit with increased humidity and explains why doors and windows are more likely to squeak and be harder to open at those times of the year.

If you still can't get the thing open, if the door is pretty simple and a standard size it might be significantly cheaper to drill it out and replace it with a new one from a home center. Some of them are less than $30 and have holes and mortices already in them for hinges and knobs, which are standard these days. All you'll need is a phillips screwdriver to replace the whole thing once you get the old one out.

$150 sounds like a lot.

If you're not already proficient at picking locks, now isn't the time to learn. Best to have a few locks on the dining table and fiddle with them in your spare time.

Get hold of keys from everybody around you. Locks are bought in a bunch; there's a good chance that somebody has a lock with the same key close by. Of the key may be close enough that, with a little wiggling, the lock opens even though the key isn't exactly right. I've been able to bypass missing-key problems that way more than once.

If the door is a lever and not a knob, you can try to work a stiff wire under the door, bent up to hook the lever and operate the door from the inside. I've done that several times, too - surprising how easy it is to defeat a $300 Level II leverset on a solid-core door, if you just know what you're doing.

And finally, there's always the locksmith. That $150 is probably to defer the crooks who are trying to get the locksmith to let them into a place where they really don't belong. Of course, that means you wind up paying extra because you want in to your own place, but there it is.

New doorknobs aren't that expensive. You could just drill it like you say, replace the knob for $50 or less and count yourself ahead.

Good luck.

Does this room have a deadbolt lock? Or is it just normally locked? If its not a deadbolt take a credit card and shimmy it above where the lock is into the crack of the door so that like half of the card is in the door and half is out. Then slide the card down towards the locked part with some shimmying the card shuld move the metal part and the door should open. Idk if this will work for you. It may take some skill. But i do it all the time when i accidently lock things.

On most knob locks the lock can be removed by just driving a screwdriver in along side the lock ( the part that spins with the key in it) Just pop out the lock then put the screwdriver in the hole and turn it to unlock the door. A new knob lock will cost about $10-$15. 2 screws to take out. Put the new lock on. 2 screws and you are done

Either pay the motel or let your stuff go. It's not worth going to jail over.

Buy a lock picking set for $10 and lock pick that sh*t.