וַיֵּצֵ֥א אֵה֖וּד הַֽמִּסְדְּר֑וֹנָה וַיִּסְגֹּ֞ר דַּלְת֧וֹת הָעַלִיָּ֛ה בַּעֲד֖וֹ וְנָעָֽל׃
Then Ehud went forth into the porch, and shut the doors of the upper chamber upon him, and locked them.
Read kabbalistic (mystical) interpretation of Judges 3:23: and classical mystical sources.