When you enter WDFW lands after hours or during a closed time of the year you are almost always charged for:
RCW 77.15.230 WAC 232-13-050.3
The above RCW states "(1) A person is guilty of unlawful use of department lands or facilities if the person enters upon, uses, or remains upon department-owned or department-controlled lands or facilities in violation of any rule of the department."
The WAC states it is illegal to violate a posted sign on WDFW lands, such as a no access sign or a sign saying open during daylight hours only.
It is essentially WDFW lands form of trespass.