No, you can't. The 5th amendment right to avoid self-incrimination only extends to testimony. A search warrant can compel you to furnish the contents of a saf

No, you can't. The 5th amendment right to avoid self-incrimination only extends to testimony. A search warrant can compel you to furnish the contents of a safe (as property, it is governed by the 4th amendment -- due process is all that is required, and in this case, the process of getting a search warrant is all that the Constitution requires).