Implementations of the present invention relate generally to systems and components for sealing and locking doors, including sliding doors for use with modular walls. A locking system can be configured to secure and release a sliding door. In particular, the locking system can include a sliding door with one or more receiving channels configured to receive a pin extending from a floor's surface. A locking mechanism can be included and configured to selectively drive a shaft to capture and release a pin that has been received by the receiving channel. The sealing system is configured to seal a gap between a modular wall and an adjacent sliding door. In particular, the sealing system can include a connector configured to connect trim to a wall panel wherein the connector includes an integrated gasket seal configured to seal the gap.