An employer cannot physically force an employee to labor. That would be involuntary servitude in violation of the U.S. Constitution, 13th Amendment. An "innkeeper," however, has authority to enter a guest room if there is a reasonable belief that an emergency exists. So, if you didn't answer the door, and the hotel manager believed you may have been in distress, then he/she could have forced entry, assuming you did not voluntarily answer the door or your room phone.
What this boils down to here is whether or not there was a reasonable belief that you were in some sort of distress. If so, then you have no claim -- otherwise, you have a claim for "invasion of privacy -- intrusion into seclusion," against both the employer and the hotel manager.
Similarly, if the employer attempting to physically force you to return to the hospital, then you would have a claim of false imprisonment and civil battery against the employer.
For a civil tort attorney referral in the state where the incident occured, see this link.
Please let me know if I can be of further assistance.