There is no universal "rule" that dictates whether the therapist should open the door for the client before and after a therapy session. This practice can vary depending on the therapist's personal style, the therapeutic setting, cultural norms, and the therapeutic relationship established between the therapist and the client.
Some therapists may choose to open the door as a gesture of hospitality and to create a warm and welcoming environment. It can also be seen as a symbolic act of inviting the client in and bidding them farewell after the session.
On the other hand, some therapists may purposefully allow the client to open the door themselves to empower them and encourage a sense of autonomy and agency. In some therapeutic approaches, this gesture might symbolize the client taking control of their own journey and progress.
Ultimately, whether the therapist opens the door or not is a matter of personal preference and may vary from therapist to therapist. The most important aspect is for the therapist to create a safe, respectful, and supportive environment for the client during the therapy session itself.