do ts ever put anything on their doors. or lock them. so others know they are in a session. just wondering because at my last session. the next client walked right in. in the middle of my session. no knocking. just opened the door. and walked in. she thought her session was earlier than it was. t told her it was later. and she left. it was quick. but surprising. and the remaining time was a bit off. its never happened before. but took away a bit of safety. which i already have trouble with. her practice is an office next to her house. maybe thats why a client would just walk in without knocking.