If door to washer/dryer combo door won't open because it is locked, disconnect power to the unit for 1 minute. Once power is restored, try it again. If the door will not unlock, it will require service.
If you continue to have problems, please contact Haier Appliances at 1-877-337-3639 or visit https://www.haierappliances.com/support/schedule-service to arrange service.